Bump packaging from 20.1 to 20.3 in /server (#401)

* Bump packaging from 20.1 to 20.3 in /server

Bumps [packaging](https://github.com/pypa/packaging) from 20.1 to 20.3.
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/master/CHANGELOG.rst)
- [Commits](pypa/packaging@20.1...20.3)

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