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[bot]]

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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