Update to support new pin endpoints

[Soheab]

Summary

• https://github.com/discord/discord-api-docs/pull/7585

Discussion thread: https://canary.discord.com/channels/336642139381301249/1381037521185538179

Checklist

• [x] If code changes were made then they have been tested.
  • [x] I have updated the documentation to reflect the changes.
• [ ] 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, ...)