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.

JIRA: https://2u-internal.atlassian.net/browse/BOM-3457

[codecov]

Codecov Report

Merging #70 (cf03130) into master (aa198b5) will not change coverage.
The diff coverage is n/a.

❗ Current head cf03130 differs from pull request most recent head 2c8c4cf. Consider uploading reports for the commit 2c8c4cf to get more accurate results

@@           Coverage Diff           @@
##           master      #70   +/-   ##
=======================================
  Coverage   95.45%   95.45%           
=======================================
  Files          16       16           
  Lines        1013     1013           
  Branches      100      100           
=======================================
  Hits          967      967           
  Misses         45       45           
  Partials        1        1           

Flag	Coverage Δ
unittests	95.45% <ø> (ø)

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