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 Process Updates
  The instructions for when and how to automate the build process were updated. This excludes certain files and folders which do not need this process.

• Requirements Changes
  Updates were made to our dependencies. We now require a higher version of PHP and other important libraries that our project depends on. This will allow us to use more advanced features in our codebase.

• Tests Enhancements
  Several unit tests in our project were modified. Most of these changes involved how these tests start and finish to make them more effective. We also updated the way we confirm results in some of these tests. This involves using a more relevant way to confirm that the test results match what we expect.

• Removal of Redundant Compatibility Code
  We have removed some code that was needed for compatibility with an older version of our testing framework. This code is no longer necessary as we have updated to a newer version.

• Setting up Sphinx and MySQL
  We've made some updates to the script that sets up these two services. These changes help to ensure that these services are configured properly for our testing environment.

• File Deletions
  Two files related to our past setup were removed because they are no longer necessary.

These updates together make our development process smoother and ensure that we can continue to deliver quality features seamlessly.

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