Bump setuptools from 46.1.3 to 49.2.0 (#51)

Bumps [setuptools](https://github.com/pypa/setuptools) from 46.1.3 to 49.2.0.
- [Release notes](https://github.com/pypa/setuptools/releases)
- [Changelog](https://github.com/pypa/setuptools/blob/master/CHANGES.rst)
- [Commits](https://github.com/pypa/setuptools/compare/v46.1.3...v49.2.0

)

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requirements.build.txt

-setuptools==46.1.3
+setuptools==49.2.0
 wheel==0.34.2