Update to julia-actions/cache

[odow]

See https://github.com/julia-actions/cache

buildpkg told me to

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.33%. Comparing base (4be967c) to head (d6c755f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3687   +/-   ##
=======================================
  Coverage   98.33%   98.33%           
=======================================
  Files          43       43           
  Lines        5696     5696           
=======================================
  Hits         5601     5601           
  Misses         95       95           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.