chore: make lint-python use requirements versions

[Lukewh]

Done

• Ensure lint-python uses the versions of black and flake8 defined in requirements.txt

How to QA

• The checks should pass for this PR

[webteam-app]

Demo starting at https://snapcraft-io-4519.demos.haus

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d064be7) 68.43% compared to head (1a7f59e) 79.83%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4519       +/-   ##
===========================================
+ Coverage   68.43%   79.83%   +11.39%     
===========================================
  Files         112      206       +94     
  Lines        3583    10501     +6918     
  Branches      926      926               
===========================================
+ Hits         2452     8383     +5931     
- Misses       1007     1994      +987     
  Partials      124      124               

Flag	Coverage Δ
javascript	68.43% <ø> (ø)
python	85.73% <ø> (?)

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[steverydz]

LGTM 👍