Cache dependencies in Github Action (#1027)

[Baschdl]

With this change, Github Action will look for a cached dependency installation based on the same pyproject.toml, load it from its cache and not need to install it again. This should make all CI tests run faster.

Checklist

• I have read and understood the contribution
  guidelines
• I agree with re-licensing my contribution from AGPLv3 to Apache-2.0.
• I rebased on main (or there are no conflicts with main)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.37%. Comparing base (4c2f71e) to head (614c33e).
Report is 9 commits behind head on main.

❗ Current head 614c33e differs from pull request most recent head deac205. Consider uploading reports for the commit deac205 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1028   +/-   ##
=======================================
  Coverage   76.37%   76.37%           
=======================================
  Files          84       84           
  Lines        6507     6507           
=======================================
  Hits         4970     4970           
  Misses       1537     1537           

Flag	Coverage Δ
unittests	76.37% <ø> (ø)

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[janfb]

I think that's a great way to make the CI run faster. But I would like to get @tomMoral feedback as well.

[Baschdl]

Caching was successful in https://github.com/sbi-dev/sbi/actions/runs/8343959002/job/22835278231. It's about 380 MB it will now download from Github's Cache server in each CI run, should take 2sec.

[tomMoral]

LGTM, a small nitpick for simplication, as you don't really need versionised cache based on pyporject.toml.

[janfb]

Great! thanks 🙏