Implement workaround for python 3.11 issue

Author: tkoskela

.github/workflows/cmake.yml

@@ -81,6 +81,13 @@ jobs:
         brew install libtiff open-mpi libyaml ccache
         echo "CMAKE_PREFIX_PATH=/usr/local/opt/libomp" >> $GITHUB_ENV
 
+    - name: Select Python 3.10
+      # otherwise turtlebrowser/get-conan@v1.1 fails on macos-12
+      # ref: https://github.com/turtlebrowser/get-conan/issues/4
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.10'
+        
     - name: Install Conan
       id: conan
       uses: turtlebrowser/get-conan@main