deps: Update dependency pytest-cov to v6

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pytest-cov (changelog)	==5.0.0 -> ==6.0.0

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Release Notes

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

### [`v6.0.0`](https://redirect.github.com/pytest-dev/pytest-cov/blob/HEAD/CHANGELOG.rst#600-2024-10-29) [Compare Source](https://redirect.github.com/pytest-dev/pytest-cov/compare/v5.0.0...v6.0.0) - 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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Configuration

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[dpebot]

/gcbrun

[averikitsch]

/gcbrun

[dpebot]

/gcbrun