Updated MacOS runners to using Github runners

[dmurphy18]

Fixes #185

Also updates location for bootstrap to https://github.com/saltstack/salt-bootstrap/releases/latest/download/bootstrap-salt.sh, new location due to Broadcom infrastructure changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.18%. Comparing base (025dd47) to head (e6d0fe9).
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #186      +/-   ##
==========================================
- Coverage   85.27%   85.18%   -0.08%     
==========================================
  Files          97       97              
  Lines        5977     5968       -9     
  Branches      636      632       -4     
==========================================
- Hits         5096     5083      -13     
- Misses        705      707       +2     
- Partials      176      178       +2     

Flag	Coverage Δ
Linux	84.64% <ø> (-0.07%)	⬇️
Windows	76.42% <ø> (+0.05%)	⬆️
macOS	75.11% <ø> (+0.05%)	⬆️
py3.10	84.91% <ø> (-0.02%)	⬇️
py3.7	?
py3.8	?
py3.9	?
pytest-7.4.0	84.91% <ø> (-0.07%)	⬇️
pytest-8.0.0	84.22% <ø> (-0.09%)	⬇️
pytest-8.1.0	?
pytest-8.1.1	84.22% <ø> (?)
pytest-8.2.0	84.22% <ø> (?)
pytest-8.3.3	84.24% <ø> (?)
salt-3006.0	?
salt-3006.9	84.91% <ø> (?)
salt-3007.0	?
salt-3007.1	84.77% <ø> (?)
src	84.91% <ø> (+7.64%)	⬆️
tests	96.28% <ø> (-0.08%)	⬇️

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see 4 files with indirect coverage changes

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