Raise PHP version to 8.1

[Tigrov]

Related PRs

• Raise PHP version to 8.1 db-sqlite#315
• Raise PHP version to 8.1 db-mysql#347
• Raise PHP version to 8.1 db-pgsql#356
• Raise PHP version to 8.1 db-mssql#317
• Raise PHP version to 8.1 db-oracle#277

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 99.55%. Comparing base (e48dcc9) to head (3933aee).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #865      +/-   ##
============================================
- Coverage     99.61%   99.55%   -0.06%     
  Complexity     1372     1372              
============================================
  Files            74       74              
  Lines          3362     3360       -2     
============================================
- Hits           3349     3345       -4     
- Misses           13       15       +2     

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[vjik]

Update rector: #867