chore: add testrun for PHP 8.3, symfony 7.0 (#52)

Author: Chris53897

.github/workflows/ci.yaml

@@ -22,15 +22,17 @@ jobs:
           - php: '8.2'
             symfony-version: 5.4
           - php: '8.2'
-            symfony-version: 6.2
+            symfony-version: 6.4
+          - php: '8.3'
+            symfony-version: 7.0
 
     name: PHP ${{ matrix.php }} - ${{ matrix.stability }} tests
     steps:
       # basically git clone
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Cache dependencies
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.composer/cache/files
           key: dependencies-php-${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}