fix(dependency_getter): stricten URL guessing

[mkniewallner]

Resolves #539.

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• [not applicable] Documentation in docs is updated

Description of changes

This strictens URL guessing when parsing requirements.txt format files by using urllib.parse.urlparse. At some point it would be nice to leverage parsing of dependencies to https://pypi.org/project/packaging/, although the library does not support legacy URL formats that AFAIK are still supported by pip, despite not being recommended anymore. I have a draft PR for this in mkniewallner#29 that I should someday finish.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.4%. Comparing base (bd78e3e) to head (3bb2173).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #570   +/-   ##
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  Coverage   90.4%   90.4%           
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  Files         39      39           
  Lines       1084    1084           
  Branches     220     220           
=====================================
  Hits         980     980           
  Misses        89      89           
  Partials      15      15           

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