build(deps): bump io.netty:netty-handler in /sdk/java/grpc

Bumps [io.netty:netty-handler](https://github.com/netty/netty) from 4.1.119.Final to 4.2.0.Final.
- [Commits](netty/netty@netty-4.1.119.Final...netty-4.2.0.Final)

---
updated-dependencies:
- dependency-name: io.netty:netty-handler
  dependency-version: 4.2.0.Final
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

sdk/java/grpc/pom.xml

@@ -112,7 +112,7 @@
             <dependency>
                 <groupId>io.netty</groupId>
                 <artifactId>netty-handler</artifactId>
-                <version>4.1.119.Final</version>
+                <version>4.2.0.Final</version>
             </dependency>
         </dependencies>
     </dependencyManagement>