Bump shalzz/zola-deploy-action from 0.20.0 to 0.21.0 (#603)

---
updated-dependencies:
- dependency-name: shalzz/zola-deploy-action
  dependency-version: 0.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/docs.yaml

@@ -24,7 +24,7 @@ jobs:
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
       - name: build
-        uses: shalzz/zola-deploy-action@c34a7626cd84c9c90499afeb310070ea838a8d1a  # v0.20.0
+        uses: shalzz/zola-deploy-action@90cd842959b82e0c012601be18ae249d6cdb1669  # v0.21.0
         env:
           BUILD_DIR: docs
           BUILD_ONLY: true