fix a few issues

lib/fed/packets/v3.0/saslinitialresponse.go

lib/gat/modes/pgbouncer/pools.go

lib/gat/pool/pool.go

lib/gat/pool/pooler.go

lib/gat/pool/pools/session/pooler.go

lib/gat/pool/pools/transaction/pooler.go

lib/rob/scheduler.go

lib/rob/schedulers/v2/scheduler.go

lib/rob/schedulers/v2/scheduler_test.go

lib/util/ring/ring_test.go