Update dependency pytest-cov to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pytest-cov (changelog)	~=5.0.0 -> ~=6.1.1
pytest-cov (changelog)	~=5.0 -> ~=6.1

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Release Notes

pytest-dev/pytest-cov (pytest-cov)

v6.1.1

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• Fixed breakage that occurs when --cov-context and the no_cover marker are used together.

v6.1.0

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• Change terminal output to use full width lines for the coverage header.
  Contributed by Tsvika Shapira in #&#8203;678 <https://github.com/pytest-dev/pytest-cov/pull/678>_.
• Removed unnecessary CovFailUnderWarning. Fixes #&#8203;675 <https://github.com/pytest-dev/pytest-cov/issues/675>_.
• Fixed the term report not using the precision specified via --cov-precision.

v6.0.0

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• Updated various documentation inaccuracies, especially on subprocess handling.
• Changed fail under checks to use the precision set in the coverage configuration.
  Now it will perform the check just like coverage report would.
• Added a --cov-precision cli option that can override the value set in your coverage configuration.
• Dropped support for now EOL Python 3.8.

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