remove category usage from the poetry detector

[tofay]

As of poetry 1.5.0 this field is no longer recorded in lockfiles: https://github.com/python-poetry/poetry/blob/master/CHANGELOG.md#150---2023-05-19

This causes the poetry detector to misclassify normal dependencies as dev dependencies, due to the existing logic of classifying dependencies as normal if and only if the category field is present and "main".

This follows the approach of #117, which conservatively adds all dependencies from the lockfile as normal dependencies lest dev dependencies be misclassified inadvertently.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (715078c) 75.3% compared to head (3622512) 75.2%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #991     +/-   ##
=======================================
- Coverage   75.3%   75.2%   -0.1%     
=======================================
  Files        236     236             
  Lines      10325   10322      -3     
  Branches    1022    1022             
=======================================
- Hits        7775    7772      -3     
  Misses      2267    2267             
  Partials     283     283             

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[github-actions]

👋 Hi! It looks like you modified some files in the Detectors folder.
You may need to bump the detector versions if any of the following scenarios apply:

• The detector detects more or fewer components than before
• The detector generates different parent/child graph relationships than before
• The detector generates different devDependencies values than before

If none of the above scenarios apply, feel free to ignore this comment 🙂