Update test runner to only run for stable versions

Author: AlexVanderbist

.github/workflows/run-tests.yml

@@ -13,7 +13,9 @@ jobs:
         strategy:
             matrix:
                 php: [8.0, 7.4, 7.3, 7.2, 7.1]
-                dependency-version: [prefer-lowest, prefer-stable]
+                dependency-version: 
+#                   - prefer-lowest
+                  - prefer-stable
                 os: [ubuntu-latest]
 
         name: P${{ matrix.php }} - ${{ matrix.dependency-version }} - ${{ matrix.os }}