VTK and HDF5 2.x incompatibility

[fcooper8472]

@kwabenantim

When we build HDF5 2.x, VTK fails to build because of:

#17 20.46   The variable `HDF5_IS_PARALLEL` was expected to have been available, but
#17 20.46   was not defined.

This is due to a breaking change in HDF5:
https://discourse.cmake.org/t/hdf5-2-0-has-breaking-changes-cmake-doesnt-set-the-hdf5-is-parallel-variable-anymore/15444

CMake's FindHDF5 has been patched:
https://gitlab.kitware.com/cmake/cmake/-/merge_requests/11573

I think that means that we can either:

• Use a very new version of CMake
• Manually pass -DHDF5_IS_PARALLEL=ON to the cmake command in

  dependency-modules/scripts/custom/install_vtk.sh

  Line 200 in 264c2a4

  cmake \

[kwabenantim]

Thanks @fcooper8472. That seems to have fixed it.
https://github.com/Chaste/dependency-modules/actions/runs/26240013430

portability-tip now has HDF5 2.1.1