update workflow config more

Author: michaeldyrynda

.github/workflows/run-tests.yml

@@ -24,7 +24,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.composer/cache/files
           key: dependencies-php-${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}