Build osx x86 installers

[mikemhenry]

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[mikemhenry]

With the changes to macos-latest we built osx-arm64 but not osx-x86 single file installers for the openfe 1.0.1 release. This PR fixes that. It will be tested by running the workflow manually in the web ui.

[mikemhenry]

testing here: https://github.com/OpenFreeEnergy/openfe/actions/runs/9454477300

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.27%. Comparing base (48dcbb2) to head (bde3645).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #865      +/-   ##
==========================================
- Coverage   94.08%   92.27%   -1.81%     
==========================================
  Files         134      134              
  Lines        9790     9790              
==========================================
- Hits         9211     9034     -177     
- Misses        579      756     +177     

Flag	Coverage Δ
fast-tests	92.27% <ø> (?)
slow-tests	?

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[mikemhenry]

It worked! Next release will not require manually upload of the osx-64 installer