ci: add PHP 8.5 to test matrix in CI workflow

Author: koriym

.github/workflows/continuous-integration.yml

@@ -19,6 +19,7 @@ jobs:
           - '8.2'
           - '8.3'
           - '8.4'
+          - '8.5'
     steps:
       - name: Checkout
         uses: actions/checkout@v4