ci: address zizmor warning

Author: tomudding

.github/workflows/coding-standards.yml

@@ -22,6 +22,8 @@ jobs:
         steps:
             -   name: Checkout
                 uses: actions/checkout@v4
+                with:
+                    persist-credentials: false
 
             -   name: Install PHP
                 uses: shivammathur/setup-php@v2