AttributeError: 'SlashCommandGroup' object has no attribute '_callback'.

Summary

Can't use CogMeta(command_attrs=...) with defined SlashCommandGroup in cog.

Reproduction Steps

1. Create cog with defined command_attrs.
2. Define SlashCommandGroup in this cog.

Minimal Reproducible Code

import discord


class EggsCog(discord.Cog, command_attrs=dict(guild_only=True)):
    slashgroup = discord.SlashCommandGroup(name="foobar")


bot = discord.Bot()
bot.add_cog(EggsCog())

Expected Results

guild_only=True attr will be applied to slashgroup.

Actual Results

Traceback (most recent call last):
  File "/home/user/test/main.py", line 4, in <module>
    class EggsCog(discord.Cog, command_attrs=dict(guild_only=True)):
  File "/home/user/test/venv/lib/python3.11/site-packages/discord/cog.py", line 233, in __new__
    new_cls.__cog_commands__ = tuple(c._update_copy(cmd_attrs) if not hasattr(c, "add_to") else c for c in new_cls.__cog_commands__)  # type: ignore
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/test/venv/lib/python3.11/site-packages/discord/cog.py", line 233, in <genexpr>
    new_cls.__cog_commands__ = tuple(c._update_copy(cmd_attrs) if not hasattr(c, "add_to") else c for c in new_cls.__cog_commands__)  # type: ignore
                                     ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/test/venv/lib/python3.11/site-packages/discord/commands/core.py", line 1370, in _update_copy
    copy = self.__class__(self.callback, **kw)
                          ^^^^^^^^^^^^^
  File "/home/user/test/venv/lib/python3.11/site-packages/discord/commands/core.py", line 261, in callback
    return self._callback
           ^^^^^^^^^^^^^^
AttributeError: 'SlashCommandGroup' object has no attribute '_callback'. Did you mean: 'callback'?

Intents

N/A

System Information

• Python v3.11.2-final
• py-cord v2.4.1-final
• aiohttp v3.8.6
• system info: Linux

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

No response

I changed line in 2.4.x

pycord/discord/commands/core.py

Line 1370 in 9d4d0f7

copy = self.__class__(self.callback, **kw)

to copy = self.__class__(**kw) and now everything works.

P.S. this line in master

pycord/discord/commands/core.py

Line 1442 in fc7b104

copy = self.__class__(self.callback, **kw)