Apply rector on PHP 8.1 update

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	-

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.61%. Comparing base (8e13022) to head (25735dd).
Report is 1 commits behind head on raise-php-version-to-81.

Additional details and impacted files

@@                    Coverage Diff                     @@
##             raise-php-version-to-81     #867   +/-   ##
==========================================================
  Coverage                      99.61%   99.61%           
  Complexity                      1372     1372           
==========================================================
  Files                             74       74           
  Lines                           3362     3362           
==========================================================
  Hits                            3349     3349           
  Misses                            13       13           

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