Bump actions/upload-artifact from v2.2.0 to v2.2.1
Bump actions/upload-artifact from v2.2.0 to v2.2.1

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from v2.2.0 to v2.2.1.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v2.2.0...726a6dcd0199f578459862705eed35cda05af50b)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
y-iihoshi/ThScoreFileConverter,y-iihoshi/ThScoreFileConverter