Hold references to ClusterNode disconnect task

[rhoboro]

Thank you for this awesome library! I've been a long-time user of this project ✨

Pull Request check-list

• Do tests and lints pass with this change?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

Description of change

I found a potential bug and have fixed it.
This fix aligns with the recommendations in the official documentation linked below, as I have personally encountered unintended task loss due to this issue in the past.

Important: Save a reference to the result of this function, to avoid a task disappearing mid-execution. The event loop only keeps weak references to tasks. A task that isn’t referenced elsewhere may get garbage collected at any time, even before it’s done. For reliable “fire-and-forget” background tasks, gather them in a collection...

https://docs.python.org/3.13/library/asyncio-task.html#asyncio.create_task

[jit-ci]

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[petyaslavova]

Hi @rhoboro, thank you for your contribution! We will review your change soon.