chore: dont lock poetry

this is a library, expected to be usable in various environments.

therefore, it is needed to run the lib in various test envs, too.



the poetry lock file is making this hard.

therefore: lets remove the poetry lock file, if possible.



for QA reasons, the ci/tests should run periodically, to check if all dependencies still match

the dev-dependnecies should be pinned to exact versions, to make testing reliable, despite the absence if a lock file.



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and for some reasons, the current lock file appears to cause problems on CI: 

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