Remove pins on flake8 linter packages

[gaugup]

Description

Remove pins of flake8 linter packages

Checklist

• I have added screenshots above for all UI changes.
• I have added e2e tests for all UI changes.
• Documentation was updated if it was needed.

[codecov-commenter]

Codecov Report

Merging #2328 (436c5a7) into main (a7f4c8c) will not change coverage.
The diff coverage is 75.00%.

@@           Coverage Diff           @@
##             main    #2328   +/-   ##
=======================================
  Coverage   88.56%   88.56%           
=======================================
  Files         133      133           
  Lines        7582     7582           
=======================================
  Hits         6715     6715           
  Misses        867      867           

Flag	Coverage Δ
unittests	88.56% <75.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
raiutils/raiutils/cohort/cohort.py	92.68% <ø> (ø)
..._vision/rai_vision_insights/rai_vision_insights.py	78.54% <50.00%> (ø)
...is/erroranalysis/_internal/process_categoricals.py	100.00% <100.00%> (ø)
...i/responsibleai/_internal/_forecasting_wrappers.py	55.29% <100.00%> (ø)

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/gaugup/RemoveFlake8Pins/dashboard/index.html

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/gaugup/RemoveFlake8Pins/dashboard/index.html