chore(deps): update dependency pytest-cov to v6

This MR contains the following updates:

Package	Type	Update	Change
pytest-cov (changelog)	dev-dependencies	major	^5.0.0 -> ^6.0.0

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Release Notes

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

v6.0.0

Compare Source

• 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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