Merge pull request #53 from pitabwire/renovate/github.com-nats-io-nat…

…s-server-v2-2.x

Update module github.com/nats-io/nats-server/v2 to v2.11.6

fix minor lint error

by default just make all jetstreams to be Nackable

ensure Ack & Nack functionality is ok on jetstream

nats native solution to getting batched messages reliably

switch to a lower receive wait timeout

fix lint issues with jetstream.go

fix issue with tests related to max batch count affecting prefetching…

… message count

fix lint issues

further improve closing semantics to use the connections.Connection o…

…bject