hmm try something else

.github/workflows/windows_build.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         config: [Release, Debug]
-        toolchain: [v143, clangcl]
+        toolchain: [torch/cmake/toolchain/windows-msvc.cmake, clangcl]
         standalone: [OFF, ON]
         generate: [Visual Studio 17 2022, Ninja]
         arch: [x64, Win32]
@@ -33,7 +33,7 @@ jobs:
           arch: ${{ matrix.arch }}
           # only use default toolchain for Ninja
       - name: Build Ninja msvc
-        if: ${{ matrix.generate == 'Ninja' && matrix.toolchain == 'v143' }}
+        if: ${{ matrix.generate == 'Ninja' && matrix.toolchain == 'torch/cmake/toolchain/windows-msvc.cmake' }}
         run: |
           cmake -S . -B "build/${{ matrix.arch }}" -G "${{ matrix.generate }}" -DCMAKE_BUILD_TYPE:STRING=${{ matrix.config }} -DUSE_STANDALONE=${{ matrix.standalone }}
           cmake --build ./build/${{ matrix.arch }} --config ${{ matrix.config }} --parallel 10

cmake/toolchain/windows-msvc.cmake

@@ -0,0 +1 @@
+set(CMAKE_GENERATOR_TOOLSET "v143")