Fix composer use in CI file

Author: akrabat

.github/workflows/tests.yml

@@ -26,12 +26,7 @@ jobs:
           php-version: ${{ matrix.php }}
           coverage: xdebug
 
-      - name: Install dependencies with Composer (PHP 8.0)
-        if: ${{ matrix.php == 8.0 }}
-        run: rm composer.lock && composer update
-
-      - name: Install dependencies with Composer (PHP 8.1+)
-        if: ${{ matrix.php >= 8.1 }}
+      - name: Install dependencies with Composer
         uses: ramsey/composer-install@v2
 
       - name: Coding standards