Ignore clippy::extra_unused_type_parameters lint in test

```
warning: type parameter goes unused in function definition
 --> src/gen/assert_impl.rs:8:15
  |
8 | fn assert_send<T: ?Sized + Send>() {}
  |               ^^^^^^^^^^^^^^^^^^
  |
  = help: consider removing the parameter
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_type_parameters
  = note: `#[warn(clippy::extra_unused_type_parameters)]` on by default

warning: type parameter goes unused in function definition
  --> src/gen/assert_impl.rs:10:15
   |
10 | fn assert_sync<T: ?Sized + Sync>() {}
   |               ^^^^^^^^^^^^^^^^^^
   |
   = help: consider removing the parameter
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_type_parameters

warning: type parameter goes unused in function definition
  --> src/gen/assert_impl.rs:12:16
   |
12 | fn assert_unpin<T: ?Sized + Unpin>() {}
   |                ^^^^^^^^^^^^^^^^^^^
   |
   = help: consider removing the parameter
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_type_parameters

warning: type parameter goes unused in function definition
  --> src/gen/assert_impl.rs:14:22
   |
14 | fn assert_unwind_safe<T: ?Sized + std::panic::UnwindSafe>() {}
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: consider removing the parameter
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_type_parameters

warning: type parameter goes unused in function definition
  --> src/gen/assert_impl.rs:16:26
   |
16 | fn assert_ref_unwind_safe<T: ?Sized + std::panic::RefUnwindSafe>() {}
   |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: consider removing the parameter
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_type_parameters
```

tools/codegen/src/file.rs

@@ -136,5 +136,6 @@ pub fn write_raw(function_name: &str, path: &Path, contents: impl AsRef<[u8]>) -
         return Ok(());
     }
     fs::write(path, out)?;
+    eprintln!("updated {}", p.display());
     Ok(())
 }

tools/codegen/src/main.rs

@@ -527,7 +527,11 @@ fn gen_assert_impl() -> Result<()> {
     }
 
     let mut out = quote! {
-        #![allow(clippy::std_instead_of_alloc, clippy::std_instead_of_core)]
+        #![allow(
+            clippy::extra_unused_type_parameters, // https://github.com/rust-lang/rust-clippy/issues/10319
+            clippy::std_instead_of_alloc,
+            clippy::std_instead_of_core,
+        )]
         #[allow(dead_code)]
         fn assert_send<T: ?Sized + Send>() {}
         #[allow(dead_code)]