Bumps [packaging](https://github.com/pypa/packaging) from 20.4 to 20.7.
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pypa/packaging/compare/20.4...20.7)