Cannot update bucket to infinite retention policy via API

I sent a request to the update bucket endpoint with a valid request. I set the retention period to 0 to make it infinite.

I get the following error:

```
expiration seconds must be greater than or equal to one second
```

I expected it to work.

Reproducing:
- create a bucket with a retention period `1h`
- send a update to taht bucket with retention period `0` to set to infinite

Start at the update bucket API endpoint and trace how a retention period of 0 is validated, comparing it with bucket creation using a 1h retention period. Reproduce the request described in the issue and verify that updating the bucket to retention period 0 succeeds and represents infinite retention.

Written by the indexing model from the issue text.