Update dependency pytest-cov to v4.1.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pytest-cov (changelog)	==4.0.0 -> ==4.1.0

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Release Notes

pytest-dev/pytest-cov

v4.1.0

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• Updated CI with new Pythons and dependencies.
• Removed rsyncdir support. This makes pytest-cov compatible with xdist 3.0.
  Contributed by Sorin Sbarnea in #&#8203;558 <https://github.com/pytest-dev/pytest-cov/pull/558>_.
• Optimized summary generation to not be performed if no reporting is active (for example,
  when --cov-report='' is used without --cov-fail-under).
  Contributed by Jonathan Stewmon in #&#8203;589 <https://github.com/pytest-dev/pytest-cov/pull/589>_.
• Added support for JSON reporting.
  Contributed by Matthew Gamble in #&#8203;582 <https://github.com/pytest-dev/pytest-cov/pull/582>_.
• Refactored code to use f-strings.
  Contributed by Mark Mayo in #&#8203;572 <https://github.com/pytest-dev/pytest-cov/pull/572>_.
• Fixed a skip in the test suite for some old xdist.
  Contributed by a bunch of people in #&#8203;565 <https://github.com/pytest-dev/pytest-cov/pull/565>_.

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