bump fixer to php 8.3

Author: Florian Engelhardt

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
   Analysis:
     strategy:
       matrix:
-        php-versions: ['8.2']
+        php-versions: ['8.3']
     runs-on: ubuntu-latest
     steps:
       - name: Checkout