BUG: Fixing of the Assimp build

Contributor: Alexis Girault <alexis.girault@kitware.com>

CMake/External/External_Assimp.cmake

@@ -4,10 +4,11 @@
 include(imstkAddExternalProject)
 imstk_add_external_project( Assimp
   GIT_REPOSITORY https://github.com/assimp/assimp.git
-  GIT_TAG v3.3.1
+  GIT_TAG v4.0.1
   INSTALL_COMMAND ${SKIP_STEP_COMMAND}
   CMAKE_ARGS
     -DASSIMP_BUILD_ASSIMP_TOOLS:BOOL=OFF
+    -DASSIMP_BUILD_TESTS:BOOL=OFF
     -DASSIMP_NO_EXPORT:BOOL=ON
     -DLIBRARY_SUFFIX:STRING=
   RELATIVE_INCLUDE_PATH "include"