Upgrade PHP version to 8.1.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[what-the-diff]

PR Summary

• Updated PHP versions in GitHub Actions workflows
  The recent update transitions our GitHub Action workflows from using PHP version 8.0 to versions 8.1, 8.2, and 8.3. With this update, our actions are compatible with the latest and more efficient versions of PHP, ensuring better performance and stability.

• Removed .env.example from static analysis monitoring
  We no longer monitor changes in the .env.example file within the static analysis workflow. This change simplifies the static analysis process as this file is not significantly linked to code quality or performance.

• Replaced the mutation job with the psalm job in the static analysis workflow
  The mutation job in the static analysis workflow has been replaced with the psalm job from yiisoft/actions. This swap improves our code analysis capability, as the psalm job offers a more comprehensive static analysis feature.

• Elevated the PHP version requirement in composer.json
  The PHP version requirement in the composer.json file was moved from ^8.0 to ^8.1. This update means our project is now specifically tailored to work optimally with the higher versions of PHP, thereby improving overall package compatibility and functionality.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f8a7ec3) 100.00% compared to head (8abfb4d) 100.00%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #307   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        20        20           
===========================================
  Files              8         8           
  Lines             58        58           
===========================================
  Hits              58        58           

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[vjik]

Additionally need update rector configuration.