Test PHP8.3

Author: barryvdh

.github/workflows/run-tests.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [7.4, 8.0, 8.1, 8.2]
+        php: [7.4, 8.0, 8.1, 8.2, 8.3]
         symfony: [^4.4, ^5.4, ^6]
         dependency-version: [prefer-lowest, prefer-stable]
         os: [ubuntu-latest]