Allow PHP 8.5

occ upgrade refused to install the app on a PHP 8.5 instance:

  Exception: App "Array" cannot be installed because the following
  dependencies are not fulfilled: PHP wird in einer frueheren Version
  als 8.4 benoetigt.

That is the max-version="8.4" in appinfo/info.xml, not a real
incompatibility -- nothing in this app is bounded above by 8.4.

Raise it to 8.5 and add 8.5 to the php-lint matrix, so CI covers the
version the server actually runs instead of stopping one below it.

.gitea/workflows/build-main.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: gitea-runner-server03
     strategy:
       matrix:
-        php-version: ['8.2', '8.3', '8.4']
+        php-version: ['8.2', '8.3', '8.4', '8.5']
     steps:
       - uses: actions/checkout@v7