Bump actions/upload-artifact from v1 to v2.2.2 (#70)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from v1 to v2.2.2.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v1...e448a9b857ee2131e752b06002bf0e093c65e571)

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

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

.github/workflows/build.yml

@@ -28,7 +28,7 @@ jobs:
 
       - name: Upload artifacts
         if: github.event_name == 'push' && startsWith(github.repository, 'efcore/')
-        uses: actions/upload-artifact@v1
+        uses: actions/upload-artifact@v2.2.2
         with:
           name: EFCore.NamingConventions
           path: nupkgs