helics: Add version 2.6.1 (#19348)
helics: Add version 2.6.1 (#19348)


LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack