Consider deduplicating dependencies

[pombredanne]

[sschuberth]

I'm not 100% certain whether this is also what @pombredanne is referring to, but running

python-inspector --requirement requirements.txt --python-version 3.11 --operating-system linux --json-pdt out.json

on requirements.txt yields out.json which contains almost every package exactly twice...

[sschuberth]

On the other hand, the following packages from requirements.txt are missing in out.json: atomicwrites, colorama, importlib-metadata, typing-extensions, zipp.