Pin some GitHub Actions

Author: swissspidy

templates/plugin-github.mustache

@@ -23,10 +23,10 @@ jobs:
           - 3306:3306
     steps:
       - name: Check out source code
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Setup PHP
-        uses: shivammathur/setup-php@v2
+        uses: shivammathur/setup-php@accd6127cb78bee3e8082180cb391013d204ef9f # v2
         with:
           php-version: ${{ matrix.php-version }}
           tools: phpunit-polyfills:1.1