Bump Darwin to v0.3.0rc3

[waltsims]

This PR bumps the dependency to the newly released rc3 of the Darwin OMP binary.

This is required before releasing #599

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.70%. Comparing base (62c4c5c) to head (87d7f90).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #610   +/-   ##
=======================================
  Coverage   73.70%   73.70%           
=======================================
  Files          50       50           
  Lines        6953     6953           
  Branches     1325     1325           
=======================================
  Hits         5125     5125           
  Misses       1283     1283           
  Partials      545      545           

Flag	Coverage Δ
3.10	73.70% <ø> (ø)
3.11	73.70% <ø> (ø)
3.12	73.70% <ø> (ø)
3.13	73.70% <ø> (ø)
macos-latest	73.68% <ø> (ø)
ubuntu-latest	73.68% <ø> (ø)
windows-latest	73.69% <ø> (ø)

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