Try workaround for flaky network in GitHub hosted runners

[bkoelman]

We often see macOS builds timeout when contacting localhost during documentation generation.

This is one of the workarounds mentioned at actions/runner-images#1187, so let's see if it helps...

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QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• Documentation updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e60f60b) 90.79% compared to head (f71c562) 90.79%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1403   +/-   ##
=======================================
  Coverage   90.79%   90.79%           
=======================================
  Files         342      342           
  Lines       11060    11060           
  Branches     1812     1812           
=======================================
  Hits        10042    10042           
  Misses        670      670           
  Partials      348      348           

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