Updates required PHP version to 7.4 or later

[gilzow]

• updates composer.json
  • require php 7.4 or greater
  • UpdatesPHPUnit to 9.6 (last version to support PHP 7.4, supports up to 8.4)
• updates github workflow
  • remove php 7.2 from matrix
  • adds php 8.1, 8.2, 8.3 and 8.4
• updates README
  • reflect name change from Platform.sh to Upsun Fixed
  • Adds Requirement section to indicate PHP 74 or greater is now required

[Copilot]

Pull request overview

This PR updates the minimum PHP version requirement from 7.2 to 7.4 and modernizes the project's branding and documentation to reflect the Platform.sh to Upsun Fixed transition.

Key Changes:

• Updates minimum PHP version to 7.4 and PHPUnit to version 9.6 for broader PHP 8.x compatibility
• Expands CI testing matrix to include PHP versions 8.1 through 8.4
• Rebrands documentation from Platform.sh to Upsun Fixed throughout the README

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
composer.json	Updates PHP requirement to >=7.4 and PHPUnit to ^9.6 for compatibility with modern PHP versions
.github/workflows/quality-assurance.yaml	Removes PHP 7.2 and adds PHP 8.1-8.4 to the CI test matrix
README.md	Rebrands from Platform.sh to Upsun Fixed and adds Requirements section documenting PHP 7.4+ requirement

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[xtfer]

Are we ever going to get a release for this??