Fix GitHub workflows on macOS

Author: ufownl

.github/workflows/build.yml

@@ -37,6 +37,7 @@ jobs:
     - name: Configure CMake
       run: >
         cmake -B ${{ github.workspace }}/lua-cgemma/build
+        -DCMAKE_POLICY_VERSION_MINIMUM=3.5
         -DCMAKE_CXX_COMPILER=${{ matrix.compiler.cxx }}
         -DCMAKE_C_COMPILER=${{ matrix.compiler.c }}
         -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}