Fix!: drop PHP 7.4–8.1 support to address insecure dependencies

[Copilot]

PHP 7.4, 8.0, and 8.1 are all end-of-life and block upgrading dependencies with known security vulnerabilities. This raises the minimum supported PHP version to 8.2.

Changes

• composer.json

  • PHP constraint: ^8.0 || ^7.4 → ^8.2
  • PHPUnit: ^8.0 || ^9.0 → ^10.0 || ^11.0 (PHPUnit 8/9 do not support PHP 8.2+)
  • PHPStan: drop ^0.12.90, require ^1.0.0 only

• .github/workflows/pr-validation.yml

  • CI matrix updated to ['8.2', '8.3', '8.4', '8.5']

• phpunit.xml

  • Replaced deprecated <filter><whitelist> (PHPUnit 8/9) with <source><include><exclude> (PHPUnit 10+)

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[adrian05-ms]

@copilot Add support for 8.5

[Copilot]

@copilot Add support for 8.5

Added PHP 8.5 to the CI test matrix in c043af3. The ^8.2 constraint in composer.json already covers 8.5 (it means >=8.2.0 <9.0.0), so no change was needed there.