Removes PHP 8.5 from testing matrix

PHP 8.5 is not yet released, so remove it from the testing matrix.
This prevents errors in the build process due to the non-existent PHP version.

Author: DeGraciaMathieu

.github/workflows/testing.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [8.2, 8.3, 8.4, 8.5]
+        php: [8.2, 8.3, 8.4]
 
     steps:
       - uses: actions/checkout@v1