Raise min PHP version to PHP 7.3, check compatibility PHP 8.3.

[terabytesoftw]

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

[what-the-diff]

PR Summary

• Updated Formatting Rule for YAML Files
  The team has enhanced the rules that dictate how YAML files are formatted to improve code readability and consistency.

• Improved Workflow Activation Conditions
  Changes have been made to the build.yml workflow. It now only activates upon certain key events (push and pull requests). There's also additional settings that direct it to ignore specific paths.

• Revised Package Dependencies
  The composer.json file, which manages package dependencies, has been revised. It now insists on an updated version of phpunit/phpunit (version "^9.6"). Additionally, the requirements listed within the file have been reordered for better clarity.

• Optimized PHPUnit Configuration
  The team upgraded the phpunit.xml.dist file with new coverage configuration. The method of performing regex assertions has also been modernized for performance and maintainability.

• Upgraded Unit Test Methods
  The DatePickerTest.php and SelectableTest.php unit tests have been tweaked. Deprecated methods have been replaced with their modern counterparts for enhanced efficiency and compatibility.

• Enhanced Compatibility for Test Files
  Finally, modifications were made to the TestCase.php and bootstrap.php files. These changes were required to render them compatible with PHPUnit 6.x. This modification results in elimination of the compatibility.php file altogether.

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