ci: use xcode 14 to build on macos

.github/workflows/build-macos-x86_64.yml

@@ -42,6 +42,11 @@ jobs:
           path: ${{github.workspace}}/dep
           key: ${{ runner.os }}-dep-cef
 
+      - name: Setup Xcode version
+        uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: '14'
+
       - name: Configure CMake
         # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
         # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type