NIFI-9468 - Bump Kafka client from 2.6.0 to 2.6.3
NIFI-9468 - Bump Kafka client from 2.6.0 to 2.6.3

This closes #5588

Signed-off-by: David Handermann <eb72b581ef337dcba9988f4e8f9ce3c59afe7a28@apache.org>

jfrazee/nifi,pvillard31/nifi,jfrazee/nifi,MikeThomsen/nifi,MikeThomsen/nifi,pvillard31/nifi,MikeThomsen/nifi,pvillard31/nifi,MikeThomsen/nifi,pvillard31/nifi,pvillard31/nifi,MikeThomsen/nifi,pvillard31/nifi,pvillard31/nifi,jfrazee/nifi,MikeThomsen/nifi,pvillard31/nifi,jfrazee/nifi,jfrazee/nifi,MikeThomsen/nifi,jfrazee/nifi,jfrazee/nifi,jfrazee/nifi