build

CI: upgrade poetry to 2.1.1 as dependabot uses it already #1145

Job	Run time
Coding style checks	48s
Test with python 3.10 / ubuntu-latest	48s
Test with python 3.12 / ubuntu-latest	41s
Test with python 3.9 / ubuntu-latest	48s
Test doc build	25s
Test with python 3.13 / ubuntu-latest	45s
Test with python 3.11 / ubuntu-latest	41s
Test with python 3.13 / windows-latest	1m 47s
	6m 43s

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