Bump io.netty:netty-buffer from 4.2.14.Final to 4.2.15.Final

Bumps [io.netty:netty-buffer](https://github.com/netty/netty) from 4.2.14.Final to 4.2.15.Final.
- [Release notes](https://github.com/netty/netty/releases)
- [Commits](netty/netty@netty-4.2.14.Final...netty-4.2.15.Final)

---
updated-dependencies:
- dependency-name: io.netty:netty-buffer
  dependency-version: 4.2.15.Final
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -42,7 +42,7 @@
         <dependency>
             <groupId>io.netty</groupId>
             <artifactId>netty-buffer</artifactId>
-            <version>4.2.14.Final</version>
+            <version>4.2.15.Final</version>
         </dependency>
         <dependency>
             <groupId>io.netty</groupId>