add php 8.5 to version matrix in tests.yaml

Author: pavog

.github/workflows/tests.yaml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        php-version: [ '8.3', '8.4' ]
+        php-version: [ '8.3', '8.4', '8.5' ]
 
     name: Run tests on PHP v${{ matrix.php-version }}
 
@@ -50,4 +50,4 @@ jobs:
         uses: ericsizemore/[email protected]
         with:
           clover_file: 'coverage.xml'
-          threshold: 75
+          threshold: 75