chore(deps): bump Java-WebSocket from 1.3.5 to 1.5.0 in /backend

Bumps [Java-WebSocket](https://github.com/TooTallNate/Java-WebSocket) from 1.3.5 to 1.5.0.
- [Release notes](https://github.com/TooTallNate/Java-WebSocket/releases)
- [Changelog](https://github.com/TooTallNate/Java-WebSocket/blob/master/CHANGELOG.md)
- [Commits](https://github.com/TooTallNate/Java-WebSocket/compare/Java-WebSocket-1.3.5...v1.5.0)

---
updated-dependencies:
- dependency-name: org.java-websocket:Java-WebSocket
  dependency-type: direct:production
...

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

backend/pom.xml

@@ -432,7 +432,7 @@
         <dependency>
             <groupId>org.java-websocket</groupId>
             <artifactId>Java-WebSocket</artifactId>
-            <version>1.3.5</version>
+            <version>1.5.0</version>
         </dependency>
         <!-- xmind export-->
         <dependency>