fix: Install pip and pip-tools in upgrade script

[Jawayria]

Updated the upgrade target script to check the compatibility of upgraded pip and pip-tools versions.
For reference, look at this openedx/edx-repo-health#271 for new check added in edx-repo-health.

[codecov]

Codecov Report

Merging #239 (4e127c5) into master (eef49e1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #239   +/-   ##
=======================================
  Coverage   94.07%   94.07%           
=======================================
  Files          29       29           
  Lines        2837     2837           
  Branches      292      292           
=======================================
  Hits         2669     2669           
  Misses        143      143           
  Partials       25       25           

Flag	Coverage Δ
unittests	94.07% <ø> (ø)

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[UsamaSadiq]

pip.in needs to include common constraints in it.