Sync repo templates ⚙

Sync with coreos/repo-templates@9066203af11543b7ec516af8311c7f840264b524.
diff --git a/.github/workflows/shellcheck.yml b/.github/workflows/shellcheck.yml
index 302c823..90f62df 100644
--- a/.github/workflows/shellcheck.yml
+++ b/.github/workflows/shellcheck.yml
@@ -16,7 +16,7 @@
     container: quay.io/coreos-assembler/fcos-buildroot:testing-devel
     steps:
       - name: Check out repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       # https://github.com/actions/checkout/issues/760
       - name: Mark git checkout as safe
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"