chore(core): fix clippy warnings

Author: JamieMason

src/registry_client.rs

@@ -1,6 +1,6 @@
 use {
   crate::dependency::UpdateUrl,
-  log::{debug, error},
+  log::debug,
   reqwest::{header::ACCEPT, Client, StatusCode},
   serde::{Deserialize, Serialize},
   serde_json::Value,

src/test/expect.rs

@@ -54,7 +54,7 @@ impl ActualInstance {
   }
 }
 
-pub fn expect(ctx: &Context) -> Expects {
+pub fn expect(ctx: &Context) -> Expects<'_> {
   Expects::new(ctx)
 }