fix: increase limit on event listeners warning

[lirantal]

Summary

Fixes #249

Proposed Changes

The toolbar widget (toolbar.on()) registers 11 event listeneres which triggers a Node.js memory leak warning:

erik@WS-91019:~$ dockly
(node:15356) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 key listeners added to [myWidget]. Use emitter.setMaxListeners() to increase limit
(Use node --trace-warnings ... to show where the warning was created)

There is no actual memory leak however, as it registers exactly 11 key presses for the toolbar.
This PR increases the limit to prevent the internal Node.js warning.

Checklist

• I added tests
• I updated the README if necessary
• This PR introduces a breaking change
• Fixed issue When exiting dockly, MaxListenersExceededWarning is displayed #249
• I added a picture of a cute animal cause it's fun

[github-actions]

🎉 This PR is included in version 3.23.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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