Add CI job running tests with PHP 8.5

Signed-off-by: Tim Goudriaan <tim@codedmonkey.com>

Author: codedmonkey

.github/workflows/tests.yaml

@@ -79,7 +79,7 @@ jobs:
           POSTGRES_USER: dirigent
     strategy:
       matrix:
-        php-version: ["8.3", "8.4"]
+        php-version: ["8.3", "8.4", "8.5"]
 
     steps:
       - name: Checkout code