Bump netty.version from 4.2.1.Final to 4.2.3.Final

Bumps `netty.version` from 4.2.1.Final to 4.2.3.Final.

Updates `io.netty:netty-bom` from 4.2.1.Final to 4.2.3.Final
- [Commits](netty/netty@netty-4.2.1.Final...netty-4.2.3.Final)

Updates `io.netty:netty-handler` from 4.2.1.Final to 4.2.3.Final
- [Commits](netty/netty@netty-4.2.1.Final...netty-4.2.3.Final)

Updates `io.netty:netty-codec-http` from 4.2.1.Final to 4.2.3.Final
- [Commits](netty/netty@netty-4.2.1.Final...netty-4.2.3.Final)

---
updated-dependencies:
- dependency-name: io.netty:netty-bom
  dependency-version: 4.2.3.Final
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: io.netty:netty-handler
  dependency-version: 4.2.3.Final
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: io.netty:netty-codec-http
  dependency-version: 4.2.3.Final
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

benchmark/pom.xml

@@ -32,7 +32,7 @@
     <jmh.version>1.37</jmh.version>
     <rx.netty.version>0.5.3</rx.netty.version>
     <rx.java.version>1.3.8</rx.java.version>
-    <netty.version>4.2.1.Final</netty.version>
+    <netty.version>4.2.3.Final</netty.version>
     <moditect.skip>true</moditect.skip>
   </properties>