Related: #493

Clearing the buffer upon timeout could lead to:

```
java.util.ConcurrentModificationException
	at java.base/java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:970)
	at java.base/java.util.LinkedList$ListItr.next(LinkedList.java:892)
	at io.socket.client.Socket$6$1.run(Socket.java:232)
	at java.base/java.util.TimerThread.mainLoop(Timer.java:556)
	at java.base/java.util.TimerThread.run(Timer.java:506)
```

Related:

- #710
- #727
- #758
- #759

Previously, getting disconnected while waiting for an acknowledgement
would create a memory leak, as the acknowledgement was never received
and the handler would stay in memory forever.

See also: socketio/socket.io-client@34cbfbb

Related: #446

In order to prevent:

> Error: Exception in thread "main" java.lang.UnsupportedClassVersionError: com/fasterxml/jackson/databind/ObjectMapper : Unsupported major.minor version 52.0
>	at java.lang.ClassLoader.defineClass1(Native Method)
>	at java.lang.ClassLoader.defineClass(ClassLoader.java:808)

Maven has been upgraded from 3.8 to 3.9, which is not compatible with JDK 7.

See also: actions/runner-images#11093

Reference: https://github.blog/changelog/2024-12-05-notice-of-upcoming-releases-and-breaking-changes-for-github-actions/#actions-cache-v1-v2-and-actions-toolkit-cache-package-closing-down

Previous version is no longer available at [1].

[1]: https://dlcdn.apache.org/maven/maven-3/