Bump io.netty:netty-buffer in /hello-websocket-java/springboot/server

Bumps [io.netty:netty-buffer](https://github.com/netty/netty) from 4.1.104.Final to 4.1.108.Final.
- [Commits](netty/netty@netty-4.1.104.Final...netty-4.1.108.Final)

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

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

Author: dependabot[bot]

hello-websocket-java/springboot/server/pom.xml

@@ -28,7 +28,7 @@
         <dependency>
             <groupId>io.netty</groupId>
             <artifactId>netty-buffer</artifactId>
-            <version>4.1.104.Final</version>
+            <version>4.1.108.Final</version>
         </dependency>
         <!-- HTML templates https://www.thymeleaf.org/ -->
         <dependency>