Extend trait_duplication_in_bounds to cover trait objects

[john-h-k]

This PR extends trait_duplication_in_bounds to cover trait objects.

Currently,

fn foo(_a: &(dyn Any + Send + Send)) {}

generates no warnings. With this PR, it will complain about a duplicate trait and can remove it

Moved from rust-lang/rust#110991

changelog: [trait_duplication_in_bounds]: warn on duplicate trait object constraints

[rustbot]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @Manishearth (or someone else) soon.

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[john-h-k]

@rustbot review

[Manishearth]

Ah, for some reason I thought this lint was incorporating supertrait bounds but now that I look closer I see that is not the case.

@bors r+

[bors]

📌 Commit b169bdb has been approved by Manishearth

It is now in the queue for this repository.

[bors]

⌛ Testing commit b169bdb with merge 77e4d7a...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: Manishearth
Pushing 77e4d7a to master...