Use contrib installation of spack-stack on Jet (#79)

- Update Jet module file to use /contrib installation of spack-stack;
- Following the failure of the lfs4 storage, spack stack was moved to
/contrib and present module file no longer works

  Resolves #78

modulefiles/gfsutils_jet.intel.lua

@@ -2,7 +2,7 @@ help([[
 Build environment for GFS utilities on Jet
 ]])
 
-prepend_path("MODULEPATH", "/lfs4/HFIP/hfv3gfs/role.epic/spack-stack/spack-stack-1.6.0/envs/gsi-addon-dev-rocky8/install/modulefiles/Core")
+prepend_path("MODULEPATH", "/contrib/spack-stack/spack-stack-1.6.0/envs/gsi-addon-intel/install/modulefiles/Core")
 
 local stack_intel_ver=os.getenv("stack_intel_ver") or "2021.5.0"
 local stack_impi_ver=os.getenv("stack_impi_ver") or "2021.5.1"