[CI] Use install-swift-tool instead of mint

[Cyberbeni]

install-swift-tool also builds tools from source, like mint but it includes caching and avoids the overhead of brew install mint

I believe that the current trigger means that it will generate a cache for every pull request. If we also add a trigger to run on pushes to the default branch then the pull requests could also load it from cache on the first run of every pull request. Source: https://docs.github.com/en/free-pro-team@latest/actions/guides/caching-dependencies-to-speed-up-workflows#restrictions-for-accessing-a-cache

[codecov[bot]]

Codecov Report

Merging #407 (5d69aef) into main (3fdebac) will increase coverage by 0.02%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #407      +/-   ##
==========================================
+ Coverage   76.11%   76.13%   +0.02%     
==========================================
  Files          62       62              
  Lines        4831     4831              
==========================================
+ Hits         3677     3678       +1     
+ Misses       1154     1153       -1     

Impacted Files	Coverage Δ
...toCore/Credential/CredentialProviderSelector.swift	84.61% <0.00%> (+7.69%)	:arrow_up:

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[Cyberbeni]

Looks like resolving dependencies took an unusually long time but that also happened with mint before. But now if we rerun the sanity check, it should complete in a couple seconds since it would load from cache.

[Cyberbeni]

This would also work on ubuntu, assuming that scripts/sanity.sh works on ubuntu