Resolve renamed_and_removed_lints warning about unknown_clippy_lints

    warning: lint `clippy::unknown_clippy_lints` has been renamed to `unknown_lints`
       --> macro/src/expand.rs:141:17
        |
    141 |     #[allow(clippy::unknown_clippy_lints)]
        |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unknown_lints`
        |
        = note: `#[warn(renamed_and_removed_lints)]` on by default

Author: dtolnay

macro/src/expand.rs

@@ -138,7 +138,7 @@ fn expand(ffi: Module, doc: Doc, attrs: OtherAttrs, apis: &[Api], types: &Types)
         #doc
         #attrs
         #[deny(improper_ctypes, improper_ctypes_definitions)]
-        #[allow(clippy::unknown_clippy_lints)]
+        #[allow(clippy::unknown_lints)]
         #[allow(
             non_camel_case_types,
             non_snake_case,