BaseExceptionGroup.derive should not copy __notes__

[cfbolz]

this makes the behaviour follow that of CPython more closely. Instead, copy notes (if present) in the callers of derive. The (modified) test passes now, and it passes on py3.11. It fails before the changes. #111

[coveralls]

Pull Request Test Coverage Report for Build 8155139303

Details

• 8 of 8 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 98.396%

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Totals
Change from base Build 7973406898:	0.02%
Covered Lines:	552
Relevant Lines:	561

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💛 - Coveralls

[agronholm]

Does anything here actually test that derive() doesn't copy __notes__?

[cfbolz]

Does anything here actually test that derive() doesn't copy __notes__?

The test changes that I did tests it, but very indirectly. So I've now added an explicit test.

[agronholm]

Thanks!