Bump actions/upload-artifact from v2.2.1 to v2.2.2 (#13)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from v2.2.1 to v2.2.2.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2.2.1...e448a9b)

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

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

.github/workflows/tests.yml

@@ -84,14 +84,14 @@ jobs:
 
       - name: Upload coverage data
         if: always() && matrix.session == 'tests'
-        uses: "actions/upload-artifact@v2.2.1"
+        uses: "actions/upload-artifact@v2.2.2"
         with:
           name: coverage-data
           path: ".coverage.*"
 
       - name: Upload documentation
         if: matrix.session == 'docs-build'
-        uses: actions/upload-artifact@v2.2.1
+        uses: actions/upload-artifact@v2.2.2
         with:
           name: docs
           path: docs/_build