Update pip to 21.0.1

[pyup-bot]

This PR updates pip from 21.0 to 21.0.1.

Changelog

### 21.0.1 ``` =================== Bug Fixes --------- - commands: debug: Use packaging.version.parse to compare between versions. (`9461 <https://github.com/pypa/pip/issues/9461>`_) - New resolver: Download and prepare a distribution only at the last possible moment to avoid unnecessary network access when the same version is already installed locally. (`9516 <https://github.com/pypa/pip/issues/9516>`_) Vendored Libraries ------------------ - Upgrade packaging to 20.9 ```

Links

- PyPI: https://pypi.org/project/pip - Changelog: https://pyup.io/changelogs/pip/ - Homepage: https://pip.pypa.io/

[coveralls]

Pull Request Test Coverage Report for Build 1295

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 1288:	0.0%
Covered Lines:	145
Relevant Lines:	145

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💛 - Coveralls