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* [Enhancement] Install a newer version of the Paramiko library.
* [Bug fix] Set upper bounds for the `install_requires` list in
`setup.py`, to match those set in `requirements.txt`. This fixes a
version incompatibility problem when the package is installed by pip
version 20 and earlier, which would lead to
`pkg_resources.ContextualVersionConflict` errors when deployed on
Open edX Maple.
* [Testing] Enhance the test matrix to include the pip versions used
in Open edX Maple (20.0.2) and Nutmeg (22.0.4), and use pipdeptree
to automatically flag dependency version inconsistencies.