chore(deps): update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/shellcheck.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@2.0.0
         with: