refactor: revert back to maximum PHP8.3 on php-cs-fixer

Author: ddevsr

.github/workflows/test-coding-standards.yml

@@ -29,7 +29,7 @@ jobs:
       matrix:
         php-version:
           - '8.1'
-          - '8.4'
+          - '8.3'
 
     steps:
       - name: Checkout