Php85 support

[vedavith]

What changed

• Raise PHP platform requirement to >=8.2 in composer.json and composer.lock; align docs (README.md) and CI matrices to test only 8.2–8.5 with coverage on 8.5.
• Replace dev dependency eloquent/liberator with vedavith/liberator-fork in composer.json.
• Update GitHub Actions (.github/workflow.yml, .github/workflows/test-unit.yml) to drop 7.4/8.0/8.1 jobs.
• Harden timeout formatting in src/Util/LockUtil.php by special-casing NAN/INF to avoid PHP 8.4 string-coercion warnings.