Update natvis to reflect 3.11.3 and the current structure of basic_json (nlohmann#4451)

* Update natvis Jinja template to reflect the current structure of basic_json.

In 5a1a575 the underlying structure of
basic_json was altered to move m_type and m_value under an m_data field.
This updates the nativ template to be consistent with this change.

* Generate nlohmann_json.natvis for 3.11.3 and latest basic_json structure.

Author: gmyers18