Will stop working from March 15, 2022 due to Github API changes

Github is sunsetting the deprecated teams API endpoints which this service is using, more details in https://github.blog/changelog/2022-02-22-sunset-notice-deprecated-teams-api-endpoints/

```
Timeline
Brownouts
March 1, 2022 for 12 hours starting at 14:00 UTC
March 8, 2022 for 24 hours starting at 14:00 UTC
If you make a request to an affected endpoint during the brownouts, GitHub will respond with a client error.

Removal
March 15, 2022 at 14:00 UTC
```

Today during the first brownout period, the service stopped working as the user sync failed returning a 404/Permission Denied.

```json
{
"level": "info",
"msg": "Run syncUsers job on start",
"time": "2022-03-01T15:51:09Z"
}
{
"job": "syncUsers",
"level": "error",
"msg": "Access denied",
"subsystem": "jobs",
"time": "2022-03-01T15:51:10Z"
}
```