MSVC2017: Work around build failure
Fixes a build failure with MSVC2017:
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\ / VC\Tools\MSVC\14.16.27023\include\xmemory(217): error C2678: / binary '*': no operator found which takes a left-hand operand / of type 'const _Iter' (or there is no acceptable conversion) with [ _Iter=vtkJson::Value::iterator ]
Closes #19581 (closed)
Backport: release
Edited by Cory Quammen