Fix mutation testing

[vjik]

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

[what-the-diff]

PR Summary

• Operating System Update in Workflow Configuration
  The workflow configuration file used for automating tasks has been modified. Now the system only utilizes the latest version of Ubuntu, an operating system, ensuring consistency and up-to-date features.

• PHP Version Update in Workflow Strategy
  There's another update made to the task automation file. It now uses version 8.3 of PHP, a programming language. This could decrease the occurrence of compatibility issues by standardizing the PHP version that's being used.

• Makefile Modification to Enhance Test Efficiency
  Changes in the Makefile, a file listing commands to create specific targets, will result in the mutation test, a testing method for finding errors, to run with more efficiency. This is due to the application of a command executing two threads simultaneously, most likely increasing the speed of testing procedures.