Compilers: Increase Minimum Microsoft Visual Studio Version to 2019

Due to the addition of the scnlib library and an update in the expat library, the minimum supported version of Microsoft Visual Studio (MSVC) for building VTK will be increased to MSVC 2019.

https://gitlab.kitware.com/vtk/vtk/-/merge_requests/12612
https://gitlab.kitware.com/vtk/vtk/-/issues/19787