Update cmake-multi-platform.yml

.github/workflows/cmake-multi-platform.yml

@@ -54,6 +54,9 @@ jobs:
       run: |
         echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
 
+    - name: Update submodules
+      run: git submodule update --init --recursive
+
     - 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