Add PHP 8.3 and PHP 8.4 to matrix

Author: ruudk

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [ '7.4', '8.0', '8.1', '8.2' ]
+        php: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
         stability: [ prefer-stable ]
 
     name: PHP ${{ matrix.php }} - ${{ matrix.stability }}