Bump importlib-metadata from 3.4.0 to 3.7.3 (#174)

Bumps [importlib-metadata](https://github.com/python/importlib_metadata) from 3.4.0 to 3.7.3.
- [Release notes](https://github.com/python/importlib_metadata/releases)
- [Changelog](https://github.com/python/importlib_metadata/blob/main/CHANGES.rst)
- [Commits](python/importlib_metadata@v3.4.0...v3.7.3)

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