chore(release): Bump version to 3.1.0

[juliusknorr]

Changelog

## 3.1.0

### Added

- Support NC 31, drop 24,25 and with it PHP <8.0 support @blizzz [#610](https://github.com/nextcloud/officeonline/pull/610)

### Fix

- fix(GS): consolidate and extend CSP management @blizzz [#559](https://github.com/nextcloud/officeonline/pull/559)
- fix: WopiLock is not 31 compatible @blizzz [#611](https://github.com/nextcloud/officeonline/pull/611)

[blizzz]

Btw, you are skipping 3.0.0.

[juliusknorr]

Damn, I was confused about versions yesterday evening 🙈 but it is out already, let's keep that

[blizzz]

Damn, I was confused about versions yesterday evening 🙈 but it is out already, let's keep that

Yeah, no worries, 💄

I do not see that it is out though:

• https://apps.nextcloud.com/apps/officeonline shows 2.3.2
• https://github.com/nextcloud-releases/officeonline/actions did not have it running either. Also, there is no tag pushed (confusingly it shows as last release)
• Maybe Github had some HicCup?