ci: Update PHP version and adjust dependency settings in testing workflow

(cherry picked from commit 6629723)

Author: roxblnfk

.github/workflows/testing.yml

@@ -27,9 +27,10 @@ jobs:
           - '8.2'
           - '8.3'
           - '8.4'
+          - '8.5'
         dependencies:
-          - lowest
-          - locked
+          # - lowest
+          # - locked
           - highest
     steps:
       - name: 📦 Check out the codebase