[CMake][ROOT-9739] Upgrade VDT built-in version from 0.4.1 to 0.4.2

this new VDT version does not assume that the Python interpreter is called
python but rather relies on CMake to invoke the right executable.

cmake/modules/SearchInstalledSoftware.cmake

@@ -1458,13 +1458,13 @@ if(vdt OR builtin_vdt)
     endif()
   endif()
   if(builtin_vdt)
-    set(vdt_version 0.4.1)
+    set(vdt_version 0.4.2)
     set(VDT_FOUND True)
     set(VDT_LIBRARIES ${CMAKE_BINARY_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}vdt${CMAKE_SHARED_LIBRARY_SUFFIX})
     ExternalProject_Add(
       VDT
       URL ${lcgpackages}/vdt-${vdt_version}.tar.gz
-      URL_HASH SHA256=020ae76518d67476c3cb9a3fdf0683ee982d6b1a5898739000072ce34063072c
+      URL_HASH SHA256=643136a38d6890c1cf18074bd494f99a4f269429ac552c57907e28c0091df8e6
       INSTALL_DIR ${CMAKE_BINARY_DIR}
       CMAKE_ARGS
         -DSSE=OFF # breaks on ARM without this