hashsum: Drop benches as covered by cksum benches

Author: oech3

.github/workflows/benchmarks.yml

@@ -30,7 +30,6 @@ jobs:
           - { package: uu_du }
           - { package: uu_expand }
           - { package: uu_fold }
-          - { package: uu_hashsum }
           - { package: uu_ls }
           - { package: uu_mv }
           - { package: uu_nl }