v5.4.1

Change log:

b11bb3a Upgrade dependencies; prepare for release
7eb0734 GH-3428: Make Kotlin dependency optional again
6565b7c Fix mngmt dependency for MetricsCaptor
fce0fef GH-3425: Remove mngmt gauges from CtxClosedEvent
0331933 Rely on MProducerSupport.active for Flux
13807ee GH-3418: Fix Poller Undeclared Checked Exceptions