Update dependency pytest to v6

This MR contains the following updates:

Package	Type	Update	Change
pytest	dev-dependencies	major	^5.4.2 -> ^6.0.0

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added 29 commits

• ce472218...e3b8caaa - 28 commits from branch master
• 0413469d - Update dependency pytest to v6

Compare with previous version

merged

mentioned in commit 5a9fb112