fix: discord/channel issues

[vmphase]

Summary

• Fixed MediaChannel.edit overload return type
• Fixed VoiceChannel.edit overload sync_permissions type
• Fixed StageChannel.edit overload sync_permissions type
• Fixed StageChannel.create_instance send_notification param type
• Fixed VoiceChannelEffectSendEvent.animation_type docstring type
• Added missing slowmode_delay, user_limit and bitrate params to StageChannel.edit

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.
• AI Usage has been disclosed.
  • If AI has been used, I understand fully what the code does

[pycord-app]

Thanks for opening this pull request!
Please make sure you have read the Contributing Guidelines and Code of Conduct.

This pull request can be checked-out with:

git fetch origin pull/3273/head:pr-3273
git checkout pr-3273

This pull request can be installed with:

pip install git+https://github.com/Pycord-Development/pycord@refs/pull/3273/head

[Lulalaby]

changelog?

[vmphase]

changelog?

Pushed

[Paillat-dev]

@Lulalaby Not sure we need a changelog, all of these are typing only and we usually don't do it for typing only changes