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](8305c0f106...b6e2e70617)

---
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>

.github/workflows/pypi-publish.yml

@@ -40,7 +40,7 @@ jobs:
           echo "PYPI_URL=https://test.pypi.org/legacy/" >> $GITHUB_ENV
         if: github.event_name == 'workflow_dispatch' && github.event.inputs.environment == 'testpypi'
 
-      - uses: dawidd6/action-download-artifact@8305c0f1062bb0d184d09ef4493ecb9288447732 # v20
+      - uses: dawidd6/action-download-artifact@b6e2e70617bc3265edd6dab6c906732b2f1ae151 # v21
         with:
           path: tmpdist/
           run_id: ${{ github.event.inputs.run_id || github.event.workflow_run.id }}