Patch VTK CMP0177 policy in CI

.github/actions/vtk-install-dep/action.yml

@@ -43,7 +43,7 @@ runs:
       uses: actions/cache@v4
       with:
         path: dependencies/vtk_install
-        key: vtk-${{env.VTK_SHA_OR_TAG}}-${{runner.os}}-${{inputs.raytracing_label}}-${{inputs.cpu}}-3
+        key: vtk-${{env.VTK_SHA_OR_TAG}}-${{runner.os}}-${{inputs.raytracing_label}}-${{inputs.cpu}}-4
 
     - name: Setup VTK
       if: steps.cache-vtk.outputs.cache-hit != 'true'
@@ -64,6 +64,12 @@ runs:
         path: './dependencies/vtk'
         ref: ${{env.VTK_SHA_OR_TAG}}
 
+    - name: Patch VTK
+      if: steps.cache-vtk.outputs.cache-hit != 'true'
+      working-directory: ${{github.workspace}}/dependencies/vtk
+      shell: bash
+      run: patch -p1 < $GITHUB_ACTION_PATH/policy_CMP0177.patch
+
       # OpenVDB_CMAKE_PATH is required because of
       # https://github.com/AcademySoftwareFoundation/openvdb/issues/1160 and
       # https://gitlab.kitware.com/vtk/vtk/-/merge_requests/10393

.github/actions/vtk-install-dep/policy_CMP0177.patch

@@ -0,0 +1,13 @@
+diff --git a/CMake/vtkModule.cmake b/CMake/vtkModule.cmake
+index b7ab326e3d..1049c4fde4 100644
+--- a/CMake/vtkModule.cmake
++++ b/CMake/vtkModule.cmake
+@@ -1,3 +1,8 @@
++# CMake 3.31 trigger a warning without this policy set
++if(POLICY CMP0174)
++  cmake_policy(SET CMP0174 OLD)
++endif()
++
+ get_filename_component(_vtkModule_dir "${CMAKE_CURRENT_LIST_FILE}" DIRECTORY)
+
+ #[==[.rst: