[try with CMake 4]

Author: kinke

.github/actions/1-setup/action.yml

@@ -60,6 +60,9 @@ runs:
         mkdir clang
         tar -xf clang.tar.xz --strip 1 -C clang
         rm clang.tar.xz
+        # also upgrade CMake to v4
+        brew install cmake
+        cmake --version
     - name: 'Windows: Install clang v19.1.3 from GitHub'
       if: runner.os == 'Windows'
       shell: bash