Modify macOS workflow to find SDK path

Updated the workflow to find the macOS SDK path instead of setting up Xcode directly.

Author: mpromonet

.github/workflows/cpp-macos.yml

@@ -11,8 +11,8 @@ jobs:
     runs-on: macos-latest
 
     steps:
-    - name: Set up Xcode
-      run: sudo xcode-select -s /Applications/Xcode_16.4.app
+    - name: find
+      run: find /Applications/Xcode_16.4.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.5.sdk
 
     - uses: actions/checkout@v5
     - run: git fetch --prune --unshallow --tags