Upgrade cmake on macOS to satisfy version 3.28 requirement

Third-party dependencies (grpc, protobuf, absl) require CMake 3.28+.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: lsk567

.github/workflows/ci.yml

@@ -47,7 +47,9 @@ jobs:
       - name: Install system dependencies (macOS)
         if: runner.os == 'macOS'
         run: |
-          brew install cmake
+          brew update
+          brew upgrade cmake || brew install cmake
+          cmake --version
 
       #===========================================
       # Build lfc from lingua-franca live-tracing2