feat: update the message pin endpoints

[Snipy7374]

Summary

• Closes update the channel pins endpoints #1305

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running pdm lint
  • I have type-checked the code by running pdm pyright
• 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, ...)

[read-the-docs-community]

Documentation build overview

📚 disnake | 🛠️ Build #29378249 | 📁 Comparing f589246 against latest (8e1bd79)

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Show files changed (49 files in total): 📝 49 modified | ➕ 0 added | ➖ 0 deleted

File	Status
genindex.html	📝 modified
index.html	📝 modified
whats_new.html	📝 modified
api/abc.html	📝 modified
api/activities.html	📝 modified
api/app_commands.html	📝 modified
api/app_info.html	📝 modified
api/audit_logs.html	📝 modified
api/automod.html	📝 modified
api/channels.html	📝 modified
api/clients.html	📝 modified
api/components.html	📝 modified
api/emoji.html	📝 modified
api/entitlements.html	📝 modified
api/events.html	📝 modified
api/exceptions.html	📝 modified
api/guild_scheduled_events.html	📝 modified
api/guilds.html	📝 modified
api/integrations.html	📝 modified
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api/invites.html	📝 modified
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api/roles.html	📝 modified
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api/users.html	📝 modified
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api/voice.html	📝 modified
api/webhooks.html	📝 modified
api/widgets.html	📝 modified
ext/tasks/index.html	📝 modified
ext/commands/api/app_commands.html	📝 modified
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ext/commands/api/help_commands.html	📝 modified
ext/commands/api/misc.html	📝 modified
ext/commands/api/prefix_commands.html	📝 modified

[onerandomusername]

LGTM at a baseline. Waiting for shiftinv for final approval

[Snipy7374]

#1314 (comment) as discussed there 6fb35ca

[shiftinv]

#1314 (comment) as discussed there 6fb35ca

Message.unpin and Permissions.manage_messages need similar changes, but lgtm otherwise!

[Snipy7374]

#1314 (comment) as discussed there 6fb35ca

Message.unpin and Permissions.manage_messages need similar changes, but lgtm otherwise!

36b9fbd

[shiftinv]

lgtm! Thank you for taking the time to implement all this :>