When using `emitWithAck` with a timeout, if clients didn't respond
and the timeout triggers, the ack callbacks remained in `socket.acks`
Map indefinitely, causing a memory leak.
Related: https://github.com/socketio/socket.io/issues/4984
In order to address the following warning when publishing:
> npm warn publish npm auto-corrected some errors in your package.json when publishing. Please run "npm pkg fix" to address these errors.
> npm warn publish errors corrected:
> npm warn publish "repository.url" was normalized to "git+https://github.com/socketio/socket.io.git"
Note: the owner of the `socket.io` repository was updated to Automattic
in [1], though it was never applied to the other repositories nor
mentioned in the client bundles.
[1]: 340281152f
