Update CIs to use julia-actions/install-juliaup

[prbzrg]

Also replaced the actions/cache with julia-actions/cache.

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All modified and coverable lines are covered by tests ✅

Project coverage is 70.38%. Comparing base (037dfed) to head (1ef67b4).
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@@            Coverage Diff             @@
##             main    #1987      +/-   ##
==========================================
+ Coverage   67.50%   70.38%   +2.88%     
==========================================
  Files          31       33       +2     
  Lines       12668    14593    +1925     
==========================================
+ Hits         8552    10272    +1720     
- Misses       4116     4321     +205     

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[wsmoses]

what's the advantage of juliaup here? Also we should keep the names 1.10, 1.11, etc explicitly

[prbzrg]

juliaup is the recommended way to install and use Julia.
The benefits are few but IMHO, we should choose it over setup-julia.

[wsmoses]

…but for CI where versions are always fixed?

imo we should use whatever reduces setup latency since these jobs are run constantly.

cc @vchuravy if you have thoughts here

[prbzrg]

I looked into some CI runs, and it seems that install-juliaup is the faster setup. (12 seconds less)~
Both have similar setup time.

[wsmoses]

If that's the case I really don't see the value add here?

My understanding of juliaup is that essentially it's a script which download's the right julia version binary as required, then dispatches to that. Which, is all good for making users lives' easier.

But in this CI context, we'll never need that functionality, and it feels like it would add extra points of failure/latency, no?

[prbzrg]

I don't think it would be any more failures. but feel free to close this one.
If in the future, there were more points, we can open this again.