[CI] Run the tests also on php v8.5

Author: rosier

.github/workflows/tests.yaml

@@ -21,7 +21,7 @@ jobs:
         strategy:
             matrix:
                 operating-system: ['ubuntu-latest']
-                php-version: ['8.2', '8.3', '8.4']
+                php-version: ['8.2', '8.3', '8.4', '8.5']
                 include:
                     - operating-system: 'macos-latest'
                       php-version: '8.2'