Added explicit link to OpenMP for MacOS Github Actions

[seanlaw]

Addresses issue #705

Pull Request Checklist

Below is a simple checklist but please do not hesitate to ask for assistance!

• Fork, clone, and checkout the newest version of the code
• Create a new branch
• Make necessary code changes
• Install black (i.e., python -m pip install black or conda install -c conda-forge black)
• Install flake8 (i.e., python -m pip install flake8 or conda install -c conda-forge flake8)
• Install pytest-cov (i.e., python -m pip install pytest-cov or conda install -c conda-forge pytest-cov)
• Run black . in the root stumpy directory
• Run flake8 . in the root stumpy directory
• Run ./setup.sh && ./test.sh in the root stumpy directory
• Reference a Github issue (and create one if one doesn't already exist)

[codecov-commenter]

Codecov Report

Base: 99.89% // Head: 99.89% // No change to project coverage 👍

Coverage data is based on head (8f24ea5) compared to base (f9a1ad7).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #706   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files          80       80           
  Lines       11453    11453           
=======================================
  Hits        11441    11441           
  Misses         12       12           

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