Bump dawidd6/action-download-artifact from 20 to 21

Bumps [dawidd6/action-download-artifact](https://github.com/dawidd6/action-download-artifact) from 20 to 21.
- [Release notes](https://github.com/dawidd6/action-download-artifact/releases)
- [Commits](dawidd6/action-download-artifact@8305c0f...b6e2e70)

---
updated-dependencies:
- dependency-name: dawidd6/action-download-artifact
  dependency-version: '21'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/publish-dev-containers.yml

@@ -37,7 +37,7 @@ jobs:
         echo "TGZ=devcontainers-cli-${VERSION}.tgz" | tee -a $GITHUB_ENV
         echo "TGZ_UPLOAD=devcontainers-cli-${VERSION}-${GITHUB_SHA:0:8}.tgz" | tee -a $GITHUB_ENV
     - name: Download TGZ
-      uses: dawidd6/action-download-artifact@8305c0f1062bb0d184d09ef4493ecb9288447732 # v20
+      uses: dawidd6/action-download-artifact@b6e2e70617bc3265edd6dab6c906732b2f1ae151 # v21
       with:
         workflow: dev-containers.yml
         workflow_conclusion: success