update interpret-community pypi release pipeline to use python 3.7

[imatiach-msft]

Update the pypi release pipeline to use python 3.7 since python 3.6 is no longer supported by default on ubuntu-latest image. See pypi release error:

https://dev.azure.com/responsibleai/interpret-community/_build/results?buildId=15569&view=logs&j=28f19d9f-f9b2-5f7b-fd26-56c3feda2482&t=93dc4bf1-918f-5b9b-51e8-fb4711dda089

[codecov-commenter]

Codecov Report

Base: 87.83% // Head: 87.83% // No change to project coverage 👍

Coverage data is based on head (b428a76) compared to base (d77678f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #552   +/-   ##
=======================================
  Coverage   87.83%   87.83%           
=======================================
  Files          62       62           
  Lines        4094     4094           
=======================================
  Hits         3596     3596           
  Misses        498      498           

Flag	Coverage Δ
unittests	87.83% <ø> (ø)

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