Allow PHP 8.5

[dgburns92]

Part of the calendar-api PHP 8.3 → 8.5 hop (BT-278): rexlabs/enum is one of the rexlabs packages whose php constraint stops Composer resolving on 8.5. Shaped like the previous PHP-support bumps in this repo.

• composer.json: php upper bound to <8.6.
• CI matrix gains 8.5 (php:X-cli-alpine, same job as before; checkout action on v4).
• CHANGELOG entry for 2.5.0.

Verification

Ran the workflow's job locally (docker run php:8.5-cli-alpine, composer update --prefer-stable, vendor/bin/phpunit): suite green on PHP 8.5 with no deprecations.

Release as 2.5.0 after merge (gh release create 2.5.0 --target main --generate-notes), which Private Packagist picks up within a minute.

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR extends the package’s declared and tested PHP support through PHP 8.5.

• Expands the Composer PHP constraint from <8.5 to <8.6.
• Adds PHP 8.5 to the Docker-backed CI matrix and upgrades checkout to v4.
• Documents the compatibility update as release 2.5.0.

Confidence Score: 5/5

The PR appears safe to merge, with the declared PHP range, CI coverage, and release notes aligned.

No actionable failure remains: PHP 8.5 is admitted by Composer, exercised by the workflow’s selected Docker image, and accurately documented.

Important Files Changed

Filename	Overview
composer.json	Expands the supported PHP range through 8.5 without changing runtime dependencies.
.github/workflows/pr_test.yml	Adds a genuine PHP 8.5 test leg and updates the checkout action’s major version.
CHANGELOG.md	Adds an accurate 2.5.0 entry documenting PHP 8.5 support.

_{Reviews (1): Last reviewed commit: "Allow PHP 8.5" | Re-trigger Greptile}