Update dependency setuptools to v51.1.1

This MR contains the following updates:

Package	Update	Change
setuptools	minor	==51.0.0 -> ==51.1.1

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Release Notes

pypa/setuptools

v51.1.1

Misc ^^^^

• #​2525: Avoid hitting network during test_virtualenv.test_test_command.

v51.1.0

Compare Source

Changes ^^^^^^^

• #​2486: Project adopts jaraco/skeleton for shared package maintenance.

Misc ^^^^

• #​2477: Restore inclusion of rst files in sdist.
• #​2484: Setuptools has replaced the master branch with the main branch.
• #​2485: Fixed failing test when pip 20.3+ is present. -- by :user:yan12125
• #​2487: Fix tests with pytest 6.2 -- by :user:yan12125

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