Attempt to fix macOS CI (#597)

.github/workflows/ci.yml

@@ -96,20 +96,21 @@ jobs:
         # Install tomlplusplus
         ./vcpkg.exe --overlay-ports=C:/robotology/robotology-vcpkg-ports install tomlplusplus:x64-windows
 
+    - name: Fixup brew [macOS]
+      if: matrix.os == 'macos-latest'
+      run: |
+          # Unlink and re-link to prevent errors when github mac runner images
+          # install python outside of brew, for example:
+          # https://github.com/orgs/Homebrew/discussions/3895
+          # https://github.com/actions/setup-python/issues/577
+          # https://github.com/actions/runner-images/issues/6459
+          # https://github.com/actions/runner-images/issues/6507
+          # https://github.com/actions/runner-images/issues/2322
+          brew list -1 | grep python | while read formula; do brew unlink $formula; brew link --overwrite $formula; done
+
     - name: Dependencies [macOS]
       if: matrix.os == 'macos-latest'
       run: |
-        # Temporary workaround for https://github.com/actions/setup-python/issues/577
-        rm -f /usr/local/bin/2to3
-        rm -f /usr/local/bin/idle3
-        rm -f /usr/local/bin/pydoc3
-        rm -f /usr/local/bin/python3
-        rm -f /usr/local/bin/python3-config
-        rm -f /usr/local/bin/2to3-3.11
-        rm -f /usr/local/bin/idle3.11
-        rm -f /usr/local/bin/pydoc3.11
-        rm -f /usr/local/bin/python3.11
-        rm -f /usr/local/bin/python3.11-config
         brew update
         brew install ace boost eigen swig qt5 orocos-kdl qhull ipopt cppad pkg-config pybind11 \
                      libmatio spdlog librealsense nlohmann-json numpy assimp