Update test.yml

Author: skoobasteeve

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
         python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Setup Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with: