typing(Thread): improve annotations

[Victorsitou]

Summary.

https://canary.discord.com/channels/808030843078836254/847513235536216085/1104843888205770752

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, ...)

[Skelmis]

Link provided isn't viewable to us regular folk, care to tl;dr?

[Victorsitou]

Link provided isn't viewable to us regular folk, care to tl;dr?

tl;dr: basically this

if not isinstance(ctx.channel, DMChannel): # DMChannel does not have name
   name = ctx.channel.name # Pylance(reportUnknownMemberType): Type of "name" is unknown, str | Unknown.

[shiftinv]

lgtm!