feat: update composer cache path in GitHub Actions.

This commit updates the path for the composer cache in the PHP workflow,
utilising `composer config cache-files-dir` for dynamic path resolution.
Improves cache handling across different environments.

.github/workflows/php.yml

@@ -38,7 +38,7 @@ jobs:
         uses: actions/cache@v4
         id: composer-cache
         with:
-          path: ${{ steps.composer-cache.outputs.dir }}
+          path: dir::$(composer config cache-files-dir)
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
 
       -