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

[terabytesoftw]

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

[what-the-diff]

PR Summary

• Build Workflow Update
  Our system's build workflow file, .github/workflows/build.yml, has been modified. This update means that certain files will be ignored during certain operations, optimizing our workflow and making the system more efficient.

• Upgrade of Testing Tools
  We updated the version of phpunit/phpunit, which is the tool we use for testing, in composer.json file. This allows us to access new features, improvements, and bug-fixes from the updated tool, ensuring our tests are more reliable. Additionally, we have specified the least version of PHP our project supports is 7.3, ensuring consistency in the environment our code runs in.

• Improvement of Test Experience
  Changes have been made to tests/GiiTestCase.php and tests/TestCase.php files, specifically to methods responsible for setting up and tearing down tests. These methods will now return a 'void' value (basically they will not return anything), making the process of running our tests smoother and reducing potential errors.

• Codebase Clean-up
  We made changes to tests/bootstrap.php by removing a line of code that was no longer necessary. This makes our code easier to read and manage. Also, we eliminated the tests/compatibility.php file as it was no longer needed. These cleanup efforts help in maintaining an efficient and manageable codebase.

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