Update the `pds` password in the `cqlshrc` file for Cassandra pods

If you change the password for the pds user, you need to also update the cqlshrc file located on all Cassandra pods:

1. Get in to all Cassandra pods:

   kubectl exec -it -n <NAMESPACE> <POD-NAME> -- bash

2. Open the cqlshrc file:

   vi ./cassandra/cqlshrc

3. Change the default user password pds with a new password.