chore: add PHP 8.5 to the workflow matrix

Author: vinkla

.github/workflows/phpunit.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [8.1, 8.2, 8.3, 8.4]
+        php: [8.1, 8.2, 8.3, 8.4, 8.5]
         extension: [":bcmath", ":gmp"]
 
     name: PHP ${{ matrix.php }}