That's a package from 2014... it's getting a bit long in the tooth, and it has about a million bugs.
If you still have AIX 6.1, you should get the latest bash that was compiled for 6.1 from https://public.dhe.ibm.com/aix/freeSoftware/aixtoolbox/RPMS/ppc/bash/ , you'll find bash-5.1.4-2.aix6.1.ppc.rpm (from 2025-05-05).
If you no longer have AIX 6.1, you should remove it.