build(deps): bump netty-codec in /java-client

Bumps [netty-codec](https://github.com/netty/netty) from 4.1.42.Final to 4.1.68.Final.
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.1.42.Final...netty-4.1.68.Final)

---
updated-dependencies:
- dependency-name: io.netty:netty-codec
  dependency-type: direct:production
...

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

java-client/pom.xml

@@ -112,7 +112,7 @@
     <dependency>
       <groupId>io.netty</groupId>
       <artifactId>netty-codec</artifactId>
-      <version>4.1.42.Final</version>
+      <version>4.1.68.Final</version>
     </dependency>
     <!-- https://mvnrepository.com/artifact/io.netty/netty-codec-http -->
     <dependency>