Update to official SimpleITK repository

This updates along the SimpleITK master branch which includes changes
to support the scikit-build front end.

Author: blowekamp

CMakeLists.txt

@@ -39,8 +39,8 @@ if(SimpleITKPythonPackage_SUPERBUILD)
   #-----------------------------------------------------------------------------
   include(ExternalProject)
 
-  set(SimpleITK_REPOSITORY git://github.com/jcfr/SimpleITK)
-  set(SimpleITK_GIT_TAG "origin/simplify-python-packaging-rebased") #v0.10.0)
+  set(SimpleITK_REPOSITORY https://itk.org/SimpleITK.git)
+  set(SimpleITK_GIT_TAG "4302e2b12ba8507f680b32deb23e4b25d2616003") #1.0.0.dev19
 
   # Add an empty external project
   function(sitk_ExternalProject_Add_Empty proj depends)