Add PHP version 8.5 to CI workflow

[kicaj]

Note

Expands supported/tested PHP versions to include 8.5.

• Adds 8.5 to GitHub Actions matrix in .github/workflows/php.yml
• Loosens Composer php constraint from <8.5 to <8.6 in composer.json to permit PHP 8.5

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[PeterOcansey]

@kicaj Thank you for the PR, #167 is now merged with some minor changes.