Bump io.netty:netty-common from 4.1.30.Final to 4.1.115.Final

Bumps [io.netty:netty-common](https://github.com/netty/netty) from 4.1.30.Final to 4.1.115.Final.
- [Commits](netty/netty@netty-4.1.30.Final...netty-4.1.115.Final)

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

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

pom.xml

@@ -93,7 +93,7 @@
         <grpc.version>1.13.2</grpc.version>
         <log4j.version>2.17.1</log4j.version>
         <hadoop.version>2.10.1</hadoop.version>
-        <netty.version>4.1.30.Final</netty.version>
+        <netty.version>4.1.115.Final</netty.version>
         <curator.version>2.7.1</curator.version>
         <junit.version>4.13.1</junit.version>
         <mockito.version>1.10.19</mockito.version>