nest: depend on py-scipy when +python (#23306)
nest: depend on py-scipy when +python (#23306)

Co-authored-by: Itaru Kitayama <8b2a3d31b4b084a9a2ef1ba3a289a0b2fe9677e3@riken.jp>
LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack