Upgrade to Netty 4.1.33.Final

Closes gh-15908

Author: wilkinsona

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -133,7 +133,7 @@
 		<narayana.version>5.8.2.Final</narayana.version>
 		<nekohtml.version>1.9.22</nekohtml.version>
 		<neo4j-ogm.version>3.1.6</neo4j-ogm.version>
-		<netty.version>4.1.31.Final</netty.version>
+		<netty.version>4.1.33.Final</netty.version>
 		<nio-multipart-parser.version>1.1.0</nio-multipart-parser.version>
 		<postgresql.version>42.2.5</postgresql.version>
 		<quartz.version>2.3.0</quartz.version>