Fix crash in digging plugin death handler (#3553)

[plainprince]

Summary

• Wraps the death event handler in lib/plugins/digging.js with a try/catch to prevent a crash when bot._events is undefined during the death event.
• This occurs when the bot dies while the EventEmitter internals are in a torn-down state, such as during Velocity proxy configuration phase transitions or when running under the Bun runtime.

Fixes #3553

Error

bot.on('death', () => {
    bot.removeAllListeners('diggingAborted')
              ^
TypeError: undefined is not an object (evaluating 'this._events')

Test plan

• Create a bot, join a server, kill the bot -- no crash
• Tested on Velocity proxy server (6b6t.org) with Bun runtime where this was consistently reproducible

Made with Cursor

[rom1504]

We should fix the root cause not ignore the problem