Add support for PHP 8.5

[sebastiaanluca]

Note

Adds PHP 8.5 support, drops 8.3, updates CI (matrix, caching), bumps dependency constraints (incl. Laravel 12.40.2), and refreshes tooling and docs.

• Breaking/Support:
  • Require php ^8.4; add support for PHP 8.5; drop PHP 8.3 (composer.json, README.md, CHANGELOG.md).
• CI (.github/workflows/test.yml):
  • Update matrix to php: [8.4, 8.5] and actions/checkout@v5.
  • Add caching for vendor and Composer cache.
  • Use --no-progress --optimize-autoloader in Composer commands.
• Dependencies (composer.json):
  • Bump illuminate/database and illuminate/support to ^11.32|^12.40.2.
  • Update dev deps: phpunit, pint, php-cs-fixer, rector.
  • Scripts: add composer bump to post-update-cmd; remove release script.
• Tooling (rector.php):
  • Simplify prepared sets (remove strict booleans); remove read-only class/property rules.
• Docs:
  • Update requirements and changelog for new PHP support.

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