Update php versions

Author: stefanheimes

.github/workflows/diagnostics.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [ '8.1', '8.2', '8.3' ]
+        php: [ '8.2', '8.3', '8.4', '8.5' ]
         contao: [ '~4.13.0' ]
         phpcq_install: [ 'update' ]
         output: [ '-o github-action -o default' ]