petsc: new version add support for +mumps +int64 (#18170)
petsc: new version add support for +mumps +int64 (#18170)

* petsc: new version add support for +mumps +int64

The latest petsc release allows using mumps while using 64 bit integers :
https://www.mcs.anl.gov/petsc/documentation/changes/313.html
https://gitlab.com/petsc/petsc/-/merge_requests/2591/

* petsc: use conflicts for mumps dependency

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