* add capnp_api.h to gitignore
* Change type of read_min_bytes from size to int
Not sure why this was not causing issues before or if that
is the right fix ... but it seems to be fine :)
* Adapt python_requires to >=3.8
This was overlooked when 3.7 was deprecated. The ci no longer
works with python 3.7 and cibuildwheel uses python_requires ...
* Replace deprecated find_module with find_spec (importlib)
find_module was deprecated with python 3.4 and python 3.12
removed it (https://docs.python.org/3.12/whatsnew/3.12.html#importlib).
The new command is find_spec and only required a few adaptions
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