Update CI/CD workflows to use `uv`
- also, remove
MANIFEST.inbecause that's not used in the poetry build backend: https://python-poetry.org/docs/basic-usage/
*** Wartungsfenster jeden ersten Mittwoch vormittag im Monat ***
MANIFEST.in because that's not used in the poetry build
backend: https://python-poetry.org/docs/basic-usage/
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