ci(cache): use os with arch for cache naming

[d33bs]

Description

This PR makes a slight change in how caching is performed within GitHub actions to include the OS arch in addition to name. I found that the cache key name appears to overlap sometimes which can cause problems for new venv builds (for example in #506 where MacOS 14 with Python 3.11 has troubles). I'd include the runner image nickname, e.g. macos-14, but this doesn't appear to be available within the runner context. I also tried making use of $ImageOS but this doesn't appear to be available on every image (and isn't very well documented).

Should be merged prior to #506 in order to address failing job.

What is the nature of your change?

• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

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• I have read the CONTRIBUTING.md guidelines.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
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• I have added tests that prove my fix is effective or that my feature works.
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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.44%. Comparing base (bf375ba) to head (d4f6236).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #508   +/-   ##
=======================================
  Coverage   94.44%   94.44%           
=======================================
  Files          57       57           
  Lines        3188     3188           
=======================================
  Hits         3011     3011           
  Misses        177      177           

Flag	Coverage Δ
unittests	94.44% <ø> (ø)

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