add PHP 8.5 to CI workflow matrix

Author: nagaihiroki-git

.github/workflows/build.yml

@@ -73,7 +73,7 @@ jobs:
     runs-on: ubuntu-24.04-arm
     strategy:
       matrix:
-        php_version: ['8.0', '8.1', '8.2', '8.3', '8.4']
+        php_version: ['8.0', '8.1', '8.2', '8.3', '8.4', '8.5']
 
     steps:
       - name: Checkout