up tut data

cmake/LibiglDownloadExternal.cmake

@@ -193,6 +193,6 @@ function(igl_download_tutorial_data)
 	igl_download_project_aux(tutorial_data
 		"${LIBIGL_EXTERNAL}/../tutorial/data"
 		GIT_REPOSITORY https://github.com/libigl/libigl-tutorial-data
-		GIT_TAG        1f8fab844173890f1e326d93c9ca6c50dad1c6b2
+		GIT_TAG        c1f9ede366d02e3531ecbaec5e3769312f31cccd
 	)
 endfunction()