Fix CI Tests and Artifact Cache Issues

[fchorney]

Use CLI script to automatically replace the 1.3 test with a 1.5 test (if necessary), as well as use new cache steps to cache the julia build artifacts

[codecov]

Codecov Report

Merging #27 (0442fee) into master (83e562b) will decrease coverage by 0.89%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
- Coverage   94.04%   93.15%   -0.90%     
==========================================
  Files           3        3              
  Lines          84       73      -11     
==========================================
- Hits           79       68      -11     
  Misses          5        5              

Impacted Files	Coverage Δ
src/test_utils.jl	92.53% <0.00%> (-1.06%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 83e562b...0442fee. Read the comment docs.