Update PHP setup action to specific version (#7)

Author: MaximillianGroup

.github/workflows/tests.yml

@@ -26,7 +26,8 @@ jobs:
       uses: actions/checkout@v4
 
     - name: Setup PHP
-      uses: shivammathur/setup-php@v2
+    # uses: shivammathur/setup-php@v2
+      uses: shivammathur/setup-php@44454db4f0199b8b9685a5d763dc37cbf79108e1
       with:
         php-version: ${{ matrix.php-version }}
         extensions: mbstring, xml, ctype, json