Silence clippy false positive (#2279)

Reported in rust-lang/rust-clippy#9798

Author: kangalio

src/model/channel/mod.rs

@@ -44,6 +44,7 @@ pub type AttachmentType<'a> = crate::builder::CreateAttachment;
 #[derive(Clone, Debug, Serialize)]
 #[serde(untagged)]
 #[non_exhaustive]
+#[allow(clippy::large_enum_variant)] // https://github.com/rust-lang/rust-clippy/issues/9798
 pub enum Channel {
     /// A channel within a [`Guild`].
     Guild(GuildChannel),