chore: ignore crossbeam-skiplist crate in cargo-machete

It's been used in the src/packages/torrent-repository package.

Author: josecelano

Cargo.toml

@@ -77,7 +77,7 @@ url = "2"
 uuid = { version = "1", features = ["v4"] }
 
 [package.metadata.cargo-machete]
-ignored = ["serde_bytes"]
+ignored = ["serde_bytes", "crossbeam-skiplist"]
 
 [dev-dependencies]
 local-ip-address = "0"