Removed python 3.6 from python PR gate

[Advitya17]

Removed 3.6 from PR gate due to deprecation and issues with torch versions above 1.12.x (eg - 1.13.1).

Description

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 #2249 (ab30371) into main (529af52) will increase coverage by 4.47%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2249      +/-   ##
==========================================
+ Coverage   88.10%   92.57%   +4.47%     
==========================================
  Files         129       55      -74     
  Lines        7337     2128    -5209     
==========================================
- Hits         6464     1970    -4494     
+ Misses        873      158     -715     

Flag	Coverage Δ
unittests	92.57% <ø> (+4.47%)	⬆️

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see 74 files with indirect coverage changes

[github-actions]

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