Remove unneeded import

Somehow this got missed, trivially remove it.

Internal change only, no logic change.

Author: tcharding

Cargo.toml

@@ -40,6 +40,7 @@ secp256k1-sys = { version = "0.11.0", default-features = false, path = "./secp25
 arbitrary = { version = "1.4", optional = true }
 rand = { version = "0.9", default-features = false, optional = true }
 serde = { version = "1.0.103", default-features = false, optional = true }
+rust_src = "0.0.0"
 
 [dev-dependencies]
 rand_xoshiro = { version = "0.7.0", default-features = false }

src/ecdsa/recovery.rs

@@ -250,7 +250,7 @@ mod tests {
 
     use super::*;
     use crate::constants::ONE;
-    use crate::{ecdsa, Error, Message, Secp256k1, SecretKey};
+    use crate::{ecdsa, Error, Message, SecretKey};
 
     #[test]
     #[cfg(all(feature = "rand", feature = "std"))]