ursa: update openmpi install hash, remove system tar external (JCSDA#1614)

Author: rickgrubin-noaa

configs/sites/tier1/ursa/packages.yaml

@@ -143,10 +143,6 @@ packages:
     externals:
     - spec: sed@4.8
       prefix: /usr
-  tar:
-    externals:
-    - spec: tar@1.34
-      prefix: /usr
   texinfo:
     externals:
     - spec: texinfo@7.1

configs/sites/tier1/ursa/packages_gcc.yaml

@@ -8,7 +8,7 @@ packages:
   openmpi:
     externals:
     - spec: openmpi@4.1.6~atomics~cuda~cxx~cxx_exceptions~gpfs~internal-hwloc~internal-libevent~internal-pmix~java+legacylaunchers~lustre~memchecker~openshmem~orterunprefix+pmi+romio+rsh~singularity+static+vt+wrapper-rpath fabrics=ucx schedulers=slurm
-      prefix: /apps/spack-2024-12/linux-rocky9-x86_64/gcc-11.4.1/openmpi-4.1.6-auzmzlihoo7n6g254nqkguxtzrdzkyqv
+      prefix: /apps/spack-2024-12/linux-rocky9-x86_64/gcc-11.4.1/openmpi-4.1.6-2dkf6t23iyw4xodxruh72yvmrhhvyoms
       modules:
       - openmpi/4.1.6