Fix feature = "cargo-clippy" deprecation

examples/handlers/stateful/src/main.rs

@@ -1,6 +1,6 @@
 //! An example of using stateful handlers with the Gotahm web framework.
 
-#![cfg_attr(feature = "cargo-clippy", allow(clippy::mutex_atomic))]
+#![cfg_attr(clippy, allow(clippy::mutex_atomic))]
 
 use futures_util::future::{self, FutureExt};
 use std::pin::Pin;

examples/shared_state/src/main.rs

@@ -4,7 +4,7 @@
 //! used across server threads, and be used to track the number of
 //! requests sent to the backend.
 
-#![cfg_attr(feature = "cargo-clippy", allow(clippy::mutex_atomic))]
+#![cfg_attr(clippy, allow(clippy::mutex_atomic))]
 
 use gotham::middleware::state::StateMiddleware;
 use gotham::pipeline::{single_middleware, single_pipeline};

gotham/src/lib.rs

@@ -8,7 +8,7 @@
 // Stricter requirements once we get to pull request stage, all warnings must be resolved.
 #![cfg_attr(feature = "ci", deny(warnings))]
 #![cfg_attr(
-    feature = "cargo-clippy",
+    clippy,
     allow(
         clippy::needless_lifetimes,
         clippy::should_implement_trait,

middleware/jwt/src/middleware.rs

@@ -196,7 +196,7 @@ mod tests {
         exp: usize,
     }
 
-    #[cfg_attr(feature = "cargo-clippy", allow(clippy::match_wild_err_arm))]
+    #[cfg_attr(clippy, allow(clippy::match_wild_err_arm))]
     fn token(alg: Algorithm) -> String {
         let claims = &Claims {
             sub: "[email protected]".to_owned(),

misc/borrow_bag/src/lib.rs

@@ -8,7 +8,7 @@
 #![warn(missing_docs, deprecated)]
 // Stricter requirements once we get to pull request stage, all warnings must be resolved.
 #![cfg_attr(feature = "ci", deny(warnings))]
-#![cfg_attr(feature = "cargo-clippy", allow(clippy::should_implement_trait))]
+#![cfg_attr(clippy, allow(clippy::should_implement_trait))]
 #![doc(test(attr(deny(warnings))))]
 // TODO: Remove this when it's a hard error by default (error E0446).
 // See Rust issue #34537 <https://github.com/rust-lang/rust/issues/34537>