Upgrade to Reactor Bismuth-RELEASE

Closes gh-10423

Author: snicoll

spring-boot-dependencies/pom.xml

@@ -149,7 +149,7 @@
 		<postgresql.version>42.1.4</postgresql.version>
 		<quartz.version>2.3.0</quartz.version>
 		<querydsl.version>4.1.4</querydsl.version>
-		<reactor-bom.version>Bismuth-RC1</reactor-bom.version>
+		<reactor-bom.version>Bismuth-RELEASE</reactor-bom.version>
 		<rest-assured.version>3.0.2</rest-assured.version>
 		<reactive-streams.version>1.0.1</reactive-streams.version>
 		<rxjava.version>1.3.2</rxjava.version>