Bump actions/download-artifact from 2.0.10 to 2.1.0 (#87)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2.0.10 to 2.1.0.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2.0.10...v2.1.0)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  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>

.github/workflows/tests.yaml

@@ -61,7 +61,7 @@ jobs:
       - name: ⤵️ Check out code from GitHub
         uses: actions/checkout@v2.4.0
       - name: ⬇️ Download coverage data
-        uses: actions/download-artifact@v2.0.10
+        uses: actions/download-artifact@v2.1.0
       - name: 🏗 Set up Python 3.9
         id: python
         uses: actions/setup-python@v2.3.1