fix: govulncheck workflow

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

.github/workflows/govulncheck.yml

@@ -13,6 +13,8 @@ jobs:
     name: govulncheck
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # pin@v4.2.2
       - name: Add variables to environment file
         run: cat ".github/env" >> "$GITHUB_ENV"
       - name: Setup Go