fix: allow adding forums to channelTypes (#8658)

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

packages/builders/src/interactions/slashCommands/mixins/ApplicationCommandOptionChannelTypesMixin.ts

@@ -11,6 +11,7 @@ const allowedChannelTypes = [
 	ChannelType.PublicThread,
 	ChannelType.PrivateThread,
 	ChannelType.GuildStageVoice,
+	ChannelType.GuildForum,
 ] as const;
 
 export type ApplicationCommandOptionAllowedChannelTypes = typeof allowedChannelTypes[number];