Bump netty.version in /readline/shell-websocket

Bumps `netty.version` from 4.1.45.Final to 4.1.50.Final.

Updates `netty-common` from 4.1.45.Final to 4.1.50.Final
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.1.45.Final...netty-4.1.50.Final)

Updates `netty-transport` from 4.1.45.Final to 4.1.50.Final
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.1.45.Final...netty-4.1.50.Final)

Updates `netty-handler` from 4.1.45.Final to 4.1.50.Final
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.1.45.Final...netty-4.1.50.Final)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

readline/shell-websocket/pom.xml

@@ -34,7 +34,7 @@
       <compiler-plugin.version>3.8.0</compiler-plugin.version>
       <jar-plugin.version>3.1.1</jar-plugin.version>
       <shade-plugin.version>3.2.1</shade-plugin.version>
-      <netty.version>4.1.45.Final</netty.version>
+      <netty.version>4.1.50.Final</netty.version>
 
       <maven.compiler.target>1.8</maven.compiler.target>
       <maven.compiler.source>1.8</maven.compiler.source>