Include PHP8.2 in CI test matrix

[ChristophWurst]

For nextcloud/groupware#40

The early bird catches the PHP8.2 bug

[codecov]

Codecov Report

Base: 41.53% // Head: 41.57% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (ceeefbc) compared to base (7c84233).
Patch coverage: 66.66% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4708      +/-   ##
============================================
+ Coverage     41.53%   41.57%   +0.04%     
  Complexity      338      338              
============================================
  Files           225      225              
  Lines          5632     5638       +6     
  Branches        738      738              
============================================
+ Hits           2339     2344       +5     
- Misses         3293     3294       +1     

Flag	Coverage Δ
javascript	31.42% <66.66%> (+<0.01%)	⬆️
php	68.57% <ø> (+0.08%)	⬆️

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Impacted Files	Coverage Δ
...nts/AppNavigation/CalendarList/CalendarListNew.vue	0.00% <0.00%> (ø)
src/views/Calendar.vue	0.00% <ø> (ø)
src/store/settings.js	94.28% <100.00%> (+0.05%)	⬆️
...s/calendar/lib/Controller/PublicViewController.php	100.00% <0.00%> (ø)
...ud/apps/calendar/lib/Controller/ViewController.php	80.95% <0.00%> (+0.46%)	⬆️

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