Update tests workflow

Author: Jubeki

.github/workflows/tests.yml

@@ -32,12 +32,6 @@ jobs:
         with:
           php-version: ${{ matrix.php-version }}
 
-      - name: Cache dependencies
-        uses: actions/cache@v4
-        with:
-          path: ~/.composer/cache/files
-          key: php-${{ matrix.php-version }}-composer-${{ hashFiles('composer.json') }}
-
       - name: Validate Composer files
         run: composer validate