fix nightly build failure on windows when installing pip

[imatiach-msft]

Nightly build is failing with error output:

Requirement already satisfied: pip in c:\miniconda\envs\interp_community\lib\site-packages (22.1.2)
Collecting pip
  Downloading pip-22.2.2-py3-none-any.whl (2.0 MB)
     ---------------------------------------- 2.0/2.0 MB 18.7 MB/s eta 0:00:00
ERROR: To modify pip, please run the following command:
C:\Miniconda\envs\interp_community\python.exe -m pip install --upgrade pip --user

This PR fixes the error by adding python -m call prior to pip install command.

[codecov-commenter]

Codecov Report

Merging #539 (8c62a86) into main (a547a7f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #539   +/-   ##
=======================================
  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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