build: release v4.7.8

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 15.49%. Comparing base (cb24b2e) to head (005f531). Report is 1 commits behind head on stable4.7.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## stable4.7 #6094 +/- ## ========================================== Coverage 15.49% 15.49% ========================================== Files 206 206 Lines 9252 9252 Branches 1928 1928 ========================================== Hits 1434 1434 Misses 7818 7818 ``` | [Flag](https://app.codecov.io/gh/nextcloud/calendar/pull/6094/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | Coverage Δ | | |---|---|---| | [javascript](https://app.codecov.io/gh/nextcloud/calendar/pull/6094/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | `15.49% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud#carryforward-flags-in-the-pull-request-comment) to find out more.

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