Replace feature = "cargo-clippy"

`cfg(feature = "cargo-clippy")` has been [deprecated]. The correct way
to achieve the same result is now `cfg(clippy)`.

[deprecated]: rust-lang/rust-clippy#12292

CHANGELOG.md

@@ -13,6 +13,14 @@ All notable changes to this project will be documented in this file.
   `AsRef<str>`, since we use the parameters in format strings. This is very
   unlikely to break anything.
 
+### Changes
+
+* Switched [code to disable Clippy][disable_clippy] to use `cfg(clippy)` instead
+  of `cfg(feature = "cargo-clippy")`. The [feature has been deprecated].
+
+[disable_clippy]: https://docs.rs/matchgen/latest/matchgen/struct.TreeMatcher.html#method.disable_clippy
+[feature has been deprecated]: https://blog.rust-lang.org/2024/02/28/Clippy-deprecating-feature-cargo-clippy.html
+
 ## Release 0.2.0 (2023-05-26)
 
 This release is primarily aimed at ensuring generated code passes lints.

src/lib.rs

@@ -361,7 +361,7 @@ impl TreeMatcher {
     ///
     /// use bstr::ByteVec;
     /// pretty_assertions::assert_str_eq!(
-    ///     r#"#[cfg(not(feature = "cargo-clippy"))]
+    ///     r#"#[cfg(not(clippy))]
     /// #[must_use]
     /// fn match_bytes(slice: &[u8]) -> (Option<u64>, &[u8]) {
     ///     match slice.first() {
@@ -370,7 +370,7 @@ impl TreeMatcher {
     ///     }
     /// }
     ///
-    /// #[cfg(feature = "cargo-clippy")]
+    /// #[cfg(clippy)]
     /// #[must_use]
     /// fn match_bytes(slice: &[u8]) -> (Option<u64>, &[u8]) {
     ///     (None, slice)
@@ -385,14 +385,14 @@ impl TreeMatcher {
     /// This can return [`io::Error`] if there is a problem writing to `writer`.
     pub fn render<W: io::Write>(&self, writer: &mut W) -> io::Result<()> {
         if self.disable_clippy {
-            writeln!(writer, "#[cfg(not(feature = \"cargo-clippy\"))]")?;
+            writeln!(writer, "#[cfg(not(clippy))]")?;
         }
 
         self.render_func(writer)?;
 
         if self.disable_clippy {
             writeln!(writer)?;
-            writeln!(writer, "#[cfg(feature = \"cargo-clippy\")]")?;
+            writeln!(writer, "#[cfg(clippy)]")?;
             self.render_stub(writer)?;
         }