chore(deps): update dependency pylint to v2.7.1

This MR contains the following updates:

Package	Update	Change
pylint (changelog)	patch	==2.7.0 -> ==2.7.1

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Release Notes

PyCQA/pylint

v2.7.1

Compare Source

===========================

• Expose UnittestLinter in pylint.testutils

• Don't check directories starting with '.' when using register_plugins

  Closes #​4119

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