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 Editor Configurations
  The .editorconfig file has been updated to ensure consistent indentation in .yml files, thereby improving code readability.
• Improved Contribution Guidelines and Funding Details
  Links in the contributing guidelines, specifically for design discussions, have been updated. Changes have also been made to the funding details regarding the Tidelift package name.
• Improved Issue Reporting and Pull Request Templates
  The templates for reporting issues and creating pull requests on GitHub have been reformatted, enabling clearer communication for contributors.
• Optimized Build Workflow on GitHub
  Infrequently modified paths have been omitted from PR and push triggers in the build workflow, thus speeding up the build process.
• Revised Dependencies and Test Environment
  The PHPUnit dependency in the composer.json file has been updated to the latest version, resulting in better testing performance, and unused dependencies have also been removed. Additionally, adjustments have been made to PHP unit tests to align with recent best practices.
• Simplified Test Set up
  Compatibility code, which was necessary for previous versions but is now redundant, has been removed from the test setup process. This simplifies and accelerates the testing process.

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