Bump spring-io/spring-doc-actions from 0.0.20 to 0.0.21 (#38)

Bumps [spring-io/spring-doc-actions](https://github.com/spring-io/spring-doc-actions) from 0.0.20 to 0.0.21.
- [Commits](spring-io/spring-doc-actions@v0.0.20...v0.0.21)

---
updated-dependencies:
- dependency-name: spring-io/spring-doc-actions
  dependency-version: 0.0.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/spring-build-and-deploy-docs.yml

@@ -51,15 +51,15 @@ jobs:
         run: cp -rf build/antora/inject-collector-cache-config-extension/.cache build/site/
 
       - name: Publish Docs
-        uses: spring-io/spring-doc-actions/[email protected].20
+        uses: spring-io/spring-doc-actions/[email protected].21
         with:
           docs-username: ${{ secrets.DOCS_USERNAME }}
           docs-host: ${{ secrets.DOCS_HOST }}
           docs-ssh-key: ${{ secrets.DOCS_SSH_KEY }}
           docs-ssh-host-key: ${{ secrets.DOCS_SSH_HOST_KEY }}
 
       - name: Bust Cloudflare Cache
-        uses: spring-io/spring-doc-actions/[email protected].20
+        uses: spring-io/spring-doc-actions/[email protected].21
         with:
           context-root: ${{ github.event.repository.name }}
           cloudflare-zone-id: ${{ secrets.CLOUDFLARE_ZONE_ID }}