chore: bump zgosalvez/github-actions-ensure-sha-pinned-actions

Bumps [zgosalvez/github-actions-ensure-sha-pinned-actions](https://github.com/zgosalvez/github-actions-ensure-sha-pinned-actions) from 3.0.20 to 3.0.21.
- [Release notes](https://github.com/zgosalvez/github-actions-ensure-sha-pinned-actions/releases)
- [Commits](zgosalvez/github-actions-ensure-sha-pinned-actions@c3a2b64...6eb1abd)

---
updated-dependencies:
- dependency-name: zgosalvez/github-actions-ensure-sha-pinned-actions
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/security-hardening.yml

@@ -30,4 +30,4 @@ jobs:
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
 
       - name: Ensure SHA Pinned Actions
-        uses: zgosalvez/github-actions-ensure-sha-pinned-actions@c3a2b64f69b7a1542a68f44d9edbd9ec3fc1455e  # v3.0.20
+        uses: zgosalvez/github-actions-ensure-sha-pinned-actions@6eb1abde32fed00453b0d03497f4ba4fecba146d  # v3.0.21