Workaround OS X GitHub Actions CI problems

Inspired by:
drogue-iot/drogue-cloud@b31e2ba

Great thanks to @ggbecker for suggestion!

Addressing:
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink bin/2to3-3.11
Target /usr/local/bin/2to3-3.11
already exists. You may want to remove it:
  rm '/usr/local/bin/2to3-3.11'

Author: jan-cerny

.github/workflows/build.yml

@@ -87,6 +87,9 @@ jobs:
     # Runs a single command using the runners shell
     - name: Install Deps
       run: |
+        # Unlink and re-link to prevent errors when GitHub Mac runner images
+        # install Python outside of Brew:
+        brew list -1 | grep python | while read formula; do brew unlink $formula; brew link --overwrite $formula; done
         brew update
         brew install doxygen
         brew install opendbx