server keeps trying to handle device list update on a server that doesn't exists anymore (301: Moved Permanently)

This issue has been migrated from [#8983](https://github.com/matrix-org/synapse/issues/8983).

---

### Description
```
2020-12-22 13:01:10,115 - root - 319 - WARNING - None - ***** STARTING SERVER *****,
2020-12-22 13:01:10,118 - root - 320 - WARNING - None - Server /usr/local/lib/python3.8/site-packages/synapse/app/homeserver.py version 1.24.0,
2020-12-22 13:01:28,935 - synapse.http.matrixfederationclient - 577 - WARNING - federation_transaction_transmission_loop-0 - {PUT-O-1} [tyjgr.com] Request failed: PUT matrix://tyjgr.com/_matrix/federation/v1/send/1608652870402: HttpResponseException('302: Found'),
2020-12-22 13:01:28,941 - synapse.federation.sender.transaction_manager - 177 - WARNING - federation_transaction_transmission_loop-0 - TX [tyjgr.com] {1608652870402} Failed to send event $misioIClpmW5V_1KW1sExYKDY_idMmB1yx-Lleiyekg,
2020-12-22 13:01:41,490 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-0 - {GET-O-24} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:01:41,494 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-0 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:02:10,600 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-1 - {GET-O-56} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:02:10,605 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-1 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:02:40,618 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-2 - {GET-O-87} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:02:40,624 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-2 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:03:10,611 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-3 - {GET-O-121} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:03:10,617 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-3 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:03:40,582 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-4 - {GET-O-153} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:03:40,587 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-4 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:04:10,589 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-5 - {GET-O-187} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:04:10,593 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-5 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:04:40,580 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-6 - {GET-O-220} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:04:40,584 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-6 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:05:10,576 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-7 - {GET-O-252} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:05:10,580 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-7 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:05:40,600 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-8 - {GET-O-284} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:05:40,604 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-8 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:06:10,590 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-9 - {GET-O-317} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:06:10,595 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-9 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:06:40,587 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-10 - {GET-O-348} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:06:40,595 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-10 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:07:10,616 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-11 - {GET-O-380} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:07:10,620 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-11 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:07:40,574 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-12 - {GET-O-412} [orthool.com] Request failed: GET matrix://orthool.com/_matrix/federation/v1/user/devices/%40lucasmendes%3Aorthool.com: HttpResponseException('301: Moved Permanently'),
2020-12-22 13:07:40,577 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-12 - Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,
2020-12-22 13:07:43,925 - synapse.http.matrixfederationclient - 577 - WARNING - _maybe_retry_device_resync-12 - {GET-O-417} [sascha-fuchs.com] Request failed: GET matrix://sascha-fuchs.com/_matrix/federation/v1/user/devices/%40palerius%3Asascha-fuchs.com: HttpResponseException('401: Unauthorized'),
2020-12-22 13:07:43,931 - synapse.handlers.device - 857 - WARNING - _maybe_retry_device_resync-12 - Failed to handle device list update for @palerius:sascha-fuchs.com: 401: Unauthorized,
2020-12-22 13:07:43,938 - synapse.logging.context - 70 - WARNING - _maybe_retry_device_resync-12 - Re-starting finished log context _maybe_retry_device_resync-12,

```

### Steps to reproduce

- during normal server operation, everything works but log gets filled up with retry messages:
`Failed to handle device list update for @lucasmendes:orthool.com: 301: Moved Permanently,`

### Version information

- **Homeserver**:

smartceva.com

- **Version**:
1.24.0
- **Install method**:

portainer
- **Platform**:

docker