Update dependency pytest to v6

This MR contains the following updates:

Package	Type	Update	Change
pytest	dev-dependencies	major	^5.3 -> ^6.0

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added 3 commits

• ba10216b...176b7c85 - 2 commits from branch master
• 1b7d9ed4 - Update dependency pytest to v6

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merged

mentioned in commit c3f1cc6f