Bump io.netty:netty-common in /sslcontext-kickstart-for-netty (#591)

Bumps [io.netty:netty-common](https://github.com/netty/netty) from 4.1.114.Final to 4.1.115.Final.
- [Commits](netty/netty@netty-4.1.114.Final...netty-4.1.115.Final)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

sslcontext-kickstart-for-netty/pom.xml

@@ -36,7 +36,7 @@
     </developers>
 
     <properties>
-        <version.netty-handler>4.1.114.Final</version.netty-handler>
+        <version.netty-handler>4.1.115.Final</version.netty-handler>
         <version.reactor-netty>1.1.23</version.reactor-netty>
     </properties>