Update multifire test to work on Hercules

Author: mkavulich

tests/WE2E/test_configs/fire/config.UFS_FIRE_multifire_two-way-coupled.yaml

@@ -40,7 +40,7 @@ fire:
   envvars:
     UFS_FIRE: True
     FIRE_GEO_EM_FILE: '{{ platform.WE2E_TEST_DATA }}/UFS_FIRE/{{ workflow.DATE_FIRST_CYCL }}/geo_em.d01.nc'
-  FIRE_NUM_TASKS: 2
+  FIRE_NUM_TASKS: 4
   DT_FIRE: 0.5
   OUTPUT_DT_FIRE: 600
   FIRE_NUM_IGNITIONS: 2