`date-format` used in OpenAPI Spec is not high enough resolution

`createdBy` is used for sorting, but the format specified is:

```
date-time:
type: string
description: Timestamp
format: date-time
pattern: "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}Z$"
example: '2024-03-20T15:30:00Z'
```

This has a resolution of seconds. Multiple releases are definitely possible in a single second - so this would mean ordering is not accurate in all scenarios.

FYI @nscuro @oej