Update Pulsar Reactive Client to 0.5.1 (#527)

Resolves #525

Author: onobc

gradle.properties

@@ -5,7 +5,7 @@ org.gradle.parallel=true
 org.gradle.jvmargs=-Xmx4g -XX:+HeapDumpOnOutOfMemoryError -XX:+UseParallelGC -Dfile.encoding=UTF-8
 
 pulsarClientVersion=3.1.1
-pulsarClientReactiveVersion=0.5.0
+pulsarClientReactiveVersion=0.5.1
 springFrameworkVersion=6.1.2
 
 # only used by integration tests and samples (unpublished deps)