Use julia actions cache in CI

[jishnub]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.79%. Comparing base (5ad4e55) to head (1aa166a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #267       +/-   ##
===========================================
+ Coverage    0.00%   89.79%   +89.79%     
===========================================
  Files          11       11               
  Lines        1858     1950       +92     
===========================================
+ Hits            0     1751     +1751     
+ Misses       1858      199     -1659     

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