Update the test matrix

Author: mpdude

.github/workflows/tests.yml

@@ -19,7 +19,6 @@ jobs:
             matrix:
                 include:
                     - { php-version: 8.1, symfony-locked-version: none, dependency-version: prefer-lowest }
-                    - { php-version: 8.2, symfony-locked-version: 5.4.*, dependency-version: prefer-stable }
                     - { php-version: 8.2, symfony-locked-version: 6.4.*, dependency-version: prefer-stable }
                     - { php-version: 8.3, symfony-locked-version: none, dependency-version: prefer-stable }
         name: PHPUnit (PHP ${{matrix.php-version}}, Symfony Version Lock ${{ matrix.symfony-locked-version }}, ${{ matrix.dependency-version }})