Raise minimal PHP version to 8.1

[vjik]

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

[what-the-diff]

PR Summary

• Updated Workflow Files

  • Various workflow files (build.yml, composer-require-checker.yml, mutation.yml, static.yml) were updated to include changes in parameters like pushing new changes to the master branch and upgrading PHP versions to more recent iterations ('8.1', '8.2', '8.3').

• PHP Version Updated

  • The PHP version was uniformly updated across different files (README.md, composer.json, .scrutinizer.yml) to 8.1, indicating that the necessary environment for running this project now requires PHP version 8.1 or higher.

• Updated Composer dependencies

  • The composer.json file noticed changes in the versions of some dependencies (like phpunit/phpunit, rector/rector, and vimeo/psalm), suggesting improvements and bug fixes that come with these new versions.

• Added issue handler and new rule in rector.php

  • A new issue handler, RiskyTruthyFalsyComparison, was added to psalm.xml to improve code analysis and verification. Meanwhile, rector.php was updated with a new PHP level and a new rule was added to skip certain rectors.

• Improved Data Reader

  • A significant change in AbstractQueryDataReader.php was made where a new property $count was added for containing the number of elements. Now, rather than returning the result instantly, the count method assigns it to this property.

• Cleaned Up Filter Files

  • For readability and cleanliness, several redundant inline docblocks have been removed from the Filter/CompareFilter.php file. It’s now easier to understand method signatures and the formatValues method implementation.
  • On another note, Filter/Exists.php was modified to make the query property read-only, enhancing the safety and robustness of the code.