Cache pip dependencies in GitHub Action

[wd60622]

Description

Read about this here: https://github.com/actions/setup-python

Not sure if it will speed up the workflow, but giving it a try.

Related Issue

• Closes #
• Related to #

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Modules affected

• MMM
• CLV
• Customer Choice

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.94%. Comparing base (aee56fe) to head (b7ce2b0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1385   +/-   ##
=======================================
  Coverage   93.94%   93.94%           
=======================================
  Files          48       48           
  Lines        5137     5137           
=======================================
  Hits         4826     4826           
  Misses        311      311           

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[wd60622]

Need to check if anything happened still

[wd60622]

Minimal savings here as the tests themselves take most of the time