Add PHP 8.3 to GitHub actions

[msmakouz]

Q	A
Bugfix?	❌
Breaks BC?	❌
New feature?	❌

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8f8adff) 89.23% compared to head (2514ab7) 89.23%.
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1028   +/-   ##
=========================================
  Coverage     89.23%   89.23%           
- Complexity     6193     6205   +12     
=========================================
  Files           816      817    +1     
  Lines         17455    17467   +12     
=========================================
+ Hits          15576    15587   +11     
- Misses         1879     1880    +1     

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