Bump actions/upload-artifact from 2.1.0 to v2.1.1 (#1860)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2.1.0 to v2.1.1.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/2.1.0...5f948bc1f0a251f88bb4c9b1c3dfa6cbd1327dc5)

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

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

.github/workflows/ci.yaml

@@ -391,7 +391,7 @@ jobs:
             -o console_output_style=count \
             tests
       - name: Upload coverage artifact
-        uses: actions/upload-artifact@2.1.0
+        uses: actions/upload-artifact@v2.1.1
         with:
           name: coverage-${{ matrix.python-version }}
           path: .coverage