fix(github-actions): use rust toolchain arm64 version for macos 14

[msga-mmm]

The tests on MacOS runner were failing due to an error in the linking step:

= note: ld: warning: ignoring file '/opt/homebrew/Cellar/openssl@3/3.3.0/lib/libssl.3.dylib': found architecture 'arm64', required architecture 'x86_64'

The tests seem to have started to fail recently which might be related to the update of macos 12 to 14 when using the tag macos-latest in the github runner:

One month ago:

Recently:

It could be fixed by pinning the macos version to 12 or using the arm64 version toolchain.

In this pull request I updated the macos tests to use the arm64 version in case this results useful.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.70%. Comparing base (33490cd) to head (60d08f9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #355      +/-   ##
==========================================
+ Coverage   90.64%   90.70%   +0.06%     
==========================================
  Files         197      197              
  Lines       31653    31664      +11     
==========================================
+ Hits        28691    28720      +29     
+ Misses       2962     2944      -18     

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[fafhrd91]

thanks!