fix: Can't register multiple plugin listeners for an event

[velocitysystems]

Reference: #13359

Arrays and Dictionaries are value types in Swift, not reference types. So when if var eventListeners = listeners[args.event] executes, then eventListeners is a copy and therefore executing .append will only affect the copy, not the original array value in the listeners dictionary.

[github-actions]

Package Changes Through b3bb271

There are 5 changes which include tauri with minor, @tauri-apps/api with minor, tauri-bundler with patch, tauri-cli with patch, @tauri-apps/cli with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
@tauri-apps/api	2.5.0	2.6.0
tauri-bundler	2.4.0	2.4.1
tauri	2.5.1	2.6.0
@tauri-apps/cli	2.5.0	2.5.1
tauri-cli	2.5.0	2.5.1

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