ci: run quality checks on PHP 8.5 to match the tooling floor

[pekral]

Shrnutí

Opravuje repo-wide selhání CI. pekral/phpcs-rules na dev-master nově vyžaduje PHP ^8.5, takže composer install na CI matici PHP 8.4 selže:

pekral/phpcs-rules dev-master requires php ^8.5 -> your php version (8.4.22) does not satisfy that requirement

To shazuje Quality Checks job u každého PR (objeveno při pokusu o merge #726). Projekt nemá require.php a všechny tři first-party pekral/* tooling závislosti jedou na dev-master, takže floor toolchainu je teď 8.5 (lokální dev už běží na 8.5).

Co se mění

• .github/workflows/pr.yml — PHP matrix 8.4 → 8.5 (název jobu, setup-php, cache klíče)
• .github/workflows/composer-update.yml — setup-php 8.4 → 8.5

Jak testovat

CI tohoto PR běží na upraveném workflow (8.5) — composer install projde a Quality Checks musí být zelené.

Odblokovává merge #726 a všech dalších PR.

[pekral]

Code Review — PR #727 (CI matrix 8.4 → 8.5)

Status: ✅ Converged — ready to merge
Counts: Critical 0 · Moderate 0 · Minor 0
Assignment conformance: no linked issue (self-directed infra fix discovered while merging #726).

Diff is a CI matrix version bump across .github/workflows/pr.yml and composer-update.yml (job name, setup-php version, cache keys) — no application code, no dependency change, no logic. CI now runs PHP 8.5 and the Quality Checks job is green (composer install resolves pekral/phpcs-rules dev-master's php ^8.5 requirement). No findings.

Checked for stray 8.4 references: CHANGELOG.md:59 is immutable release history (left as-is) and README.md:20 describes the PHP version the shipped guidelines target for consumer projects (a separate concern from this repo's own CI toolchain), so neither needs changing here.

Summary: assignment conformance: no linked issue. Minimal, correct CI-toolchain fix; no blocking findings.