Small changes in logs and docs

[patrikspiess]

No description provided.

[patrikspiess]

Now, when using fotoobo as module in another python project mypy will know its types correctly.
see: https://jugmac00.github.io/blog/bite-my-shiny-type-annotated-library/#poetry
or: https://blog.whtsky.me/tech/2021/dont-forget-py.typed-for-your-typed-python-package/

Also, updating pytest to 9.0.3 due to a security warning from dependabot

[lucmurer]

Please review the docs/source/usage/import_fotoobo.rst, so the intention of the described part is more clear.

Rest is OK!