minor #2842 [CI] PHPStan: use PHP version from the matrix (alexislefebvre)

This PR was merged into the 2.x branch.

Discussion
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[CI] PHPStan: use PHP version from the matrix

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Docs?         | no
| Issues        | Fix
| License       | MIT

It installed PHP 8.1 instead of using various versions.

Commits
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efef74c chore: PHPStan: use PHP version from the matrix

Author: Kocal

.github/workflows/code-quality.yaml

@@ -78,7 +78,7 @@ jobs:
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: '8.1'
+                    php-version: ${{ matrix.php-version }}
                     tools: flex
 
             - name: Install root dependencies