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

Bumps the workflow-actions group with 1 update: [zgosalvez/github-actions-ensure-sha-pinned-actions](https://github.com/zgosalvez/github-actions-ensure-sha-pinned-actions).


Updates `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
  dependency-group: workflow-actions
...

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

.github/workflows/build.yaml

@@ -20,7 +20,7 @@ jobs:
     - uses: 'hmarr/debug-action@cd1afbd7852b7ad7b1b7a9a1b03efebd3b0a1820' # v3.0.0
 
     # https://github.com/zgosalvez/github-actions-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
 
     # https://github.com/actions/checkout
     - name: 'checkout'