Bumps [importlib-metadata](https://github.com/python/importlib_metadata) from 2.0.0 to 3.1.0.
- [Release notes](https://github.com/python/importlib_metadata/releases)
- [Changelog](https://github.com/python/importlib_metadata/blob/master/CHANGES.rst)
- [Commits](https://github.com/python/importlib_metadata/compare/v2.0.0...v3.1.0)