Arg metatdata in Guild.create_scheduled_event is optional, but Discord API requires it

[ToasterUwU]

Summary

If metadata (optional) is not set, it will result in a 400 Bad Request Error

Reproduction Steps

• Make a simple basic bot
• Get any guild
• Create a event without metadata
• See the error

Minimal Reproducible Code

No response

Expected Results

Event should be created with just no metadata

Actual Results

Exception has occurred: HTTPException
400 Bad Request (error code: 50035): Invalid Form Body
In entity_metadata: This field is required

Intents

Default

System Information

• Python v3.11.6-final
• nextcord v2.6.0-final
• aiohttp v3.9.1
• system info: Linux 6.6.6-pikaos #4 SMP PREEMPT_DYNAMIC Tue Dec 12 11:16:44 UTC 2023

Checklist

• I have searched the open issues for duplicates.
• I have shown the entire traceback, if possible.
• I have removed my token from display, if visible.

Additional Context

I dont have time to make a PR for this atm, so I will leave this issue here, and if I find the time make a PR for it.