Feature/minimum python version 3.9

As stated here: !4 (comment 2633787) Python version 3.7 and soon 3.8 will reach their end-of-life. This MR removes support for them.

added support label

assigned to @pascal.palenda

added 8 commits

• 369968d4 - Feat: remove support for 3.7 and 3.8
• e6820e2c - Fix: linter errors
• 9356591e - Fix remove duplicate optional
• 483bd500 - Fix: type alias
• a9226443 - Chore: update `CHANGELOG`
• b6a8bbab - Refactor: clean-up pyproject file
• 0783eaba - Fix: linter errors
• 145200cd - Feat: improve type checks

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added 1 commit

• 9074c994 - Style: formatting

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mentioned in merge request !4 (merged)

added 1 commit

• c166648a - Fix: check for the correct error in tests

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marked this merge request as ready

requested review from @cmo, @schaefer, and @rouben.rehman

approved this merge request

approved this merge request

changed title from Feature/python version to Feature/minimum python version 3.9

mentioned in commit f343db25

merged