Bump actions/upload-artifact from v2.1.1 to v2.1.2 (#38505)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from v2.1.1 to v2.1.2.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v2.1.1...c8879bf5aef7bef66f9b82b197f34c4eeeb1731b)

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

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

.github/workflows/ci.yaml

@@ -737,7 +737,7 @@ jobs:
             -p no:sugar \
             tests
       - name: Upload coverage artifact
-        uses: actions/upload-artifact@v2.1.1
+        uses: actions/upload-artifact@v2.1.2
         with:
           name: coverage-${{ matrix.python-version }}-group${{ matrix.group }}
           path: .coverage