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 #9 (8ae0474) into main (91c912c) will decrease coverage by 1.63%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
- Coverage   92.68%   91.04%   -1.64%     
==========================================
  Files           3        3              
  Lines          82       67      -15     
==========================================
- Hits           76       61      -15     
  Misses          6        6              

Impacted Files	Coverage Δ
src/Checkpoints.jl	85.00% <0.00%> (-3.47%)	⬇️
src/handler.jl	88.00% <0.00%> (-1.66%)	⬇️
src/session.jl	100.00% <0.00%> (ø)

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