Use cache from python github actions

[jenshnielsen]

• Reflects change in qcodes.
• Less code to maintain
• Avoids deprecation warnings

[codecov-commenter]

Codecov Report

Merging #177 (b5d0248) into main (b5d0248) will not change coverage.
The diff coverage is n/a.

❗ Current head b5d0248 differs from pull request most recent head 8961690. Consider uploading reports for the commit 8961690 to get more accurate results

@@           Coverage Diff           @@
##             main     #177   +/-   ##
=======================================
  Coverage   19.38%   19.38%           
=======================================
  Files         125      125           
  Lines       15700    15700           
=======================================
  Hits         3043     3043           
  Misses      12657    12657           

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[jenshnielsen]

Should be merged after #178 so cache looks at the right file