Bump version.netty-handler from 4.2.2.Final to 4.2.3.Final (#660)

---
updated-dependencies:
- 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-resolver-dns
  dependency-version: 4.2.3.Final
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: io.netty:netty-transport-native-epoll
  dependency-version: 4.2.3.Final
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: io.netty:netty-codec-http2
  dependency-version: 4.2.3.Final
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: io.netty:netty-transport-native-unix-common
  dependency-version: 4.2.3.Final
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: io.netty:netty-resolver-dns-native-macos
  dependency-version: 4.2.3.Final
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: io.netty:netty-buffer
  dependency-version: 4.2.3.Final
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: io.netty:netty-codec
  dependency-version: 4.2.3.Final
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: io.netty:netty-common
  dependency-version: 4.2.3.Final
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: io.netty:netty-transport
  dependency-version: 4.2.3.Final
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

sslcontext-kickstart-for-netty/pom.xml

@@ -36,7 +36,7 @@
     </developers>
 
     <properties>
-        <version.netty-handler>4.2.2.Final</version.netty-handler>
+        <version.netty-handler>4.2.3.Final</version.netty-handler>
         <version.reactor-netty>1.2.8</version.reactor-netty>
     </properties>