Update ghcr.io/twin/gatus Docker tag to v5.23.1 (#1241)
This PR contains the following updates:
| Package | Update | Change |
|---|---|---|
| [ghcr.io/twin/gatus](https://github.com/TwiN/gatus) | minor | `v5.22.0` -> `v5.23.1` |
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### Release Notes
<details>
<summary>TwiN/gatus (ghcr.io/twin/gatus)</summary>
### [`v5.23.1`](https://github.com/TwiN/gatus/releases/tag/v5.23.1)
[Compare Source](https://github.com/TwiN/gatus/compare/v5.23.0...v5.23.1)
#### What's Changed
- fix(ui): Update endpoints in-place instead of reloading every time by [@​TwiN](https://github.com/TwiN) in https://github.com/TwiN/gatus/pull/1209
- docs: improve `extra-labels` description by [@​salim-b](https://github.com/salim-b) in https://github.com/TwiN/gatus/pull/1208
**Full Changelog**: https://github.com/TwiN/gatus/compare/v5.23.0...v5.23.1
### [`v5.23.0`](https://github.com/TwiN/gatus/releases/tag/v5.23.0)
[Compare Source](https://github.com/TwiN/gatus/compare/v5.22.0...v5.23.0)
This is a big one, and for the occasion, I'll highlight the two big changes:
- **New UI**: That's right, a brand new modern UI. This was long overdue. I hope you like it.
- **Announcements**: Want to update your users/customers about an outage? You can, now.

Thoughts on the UI & announcements? Just like any healthy relationship, communicate with me on [TwiN/gatus#1206](https://github.com/TwiN/gatus/discussions/1206)
#### What's Changed
- feat(ui): New status page UI by [@​TwiN](https://github.com/TwiN) in https://github.com/TwiN/gatus/pull/1198
- feat: Implement announcements by [@​TwiN](https://github.com/TwiN) in https://github.com/TwiN/gatus/pull/1204
- feat(alerting): Support extra labels in email alerts by [@​appleboy](https://github.com/appleboy) in https://github.com/TwiN/gatus/pull/1191
- fix(ui): Replace filter value "nothing" by "none" by [@​TwiN](https://github.com/TwiN) in https://github.com/TwiN/gatus/pull/1202
- docs: tweak `minimum-reminder-interval` description by [@​salim-b](https://github.com/salim-b) in https://github.com/TwiN/gatus/pull/1194
**Full Changelog**: https://github.com/TwiN/gatus/compare/v5.22.0...v5.23.0
</details>
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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
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Reviewed-on: #1241
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