CI fails due to VTK CMake error

[2xB]

Since a few days we get

CMake Error at /usr/lib64/cmake/vtk/VTK-targets.cmake:553 (set_target_properties):
  The link interface of target "VTK::nlohmannjson" contains:
    nlohmann_json::nlohmann_json
  but the target was not found.  Possible reasons include:
    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.

in our Fedora 40 based CI pipelines. As can be seen in #131, this is not fixed by updating to Fedora 41.

More details: https://discourse.vtk.org/t/cmake-error-vtk-nlohmannjson/15170