Came back to look at rust and found out that this had been broken by some refactoring work. Fixed and now has tests.

Downgrade new_ret_no_self to pedantic

As motivated by rust-lang#5418. This is the second most widely suppressed Clippy style lint, and [this grep.app search](https://grep.app/search?q=%5C%5Ballow%5C%28.%2Aclippy%3A%3Anew_ret_no_self%5Cb&regexp=true&case=true&filter[lang][0]=Rust) shows a large number of diverse reasonable signatures for a `new` method.

changelog: Remove new_ret_no_self from default set of enabled lints

Rollup of 11 pull requests

Successful merges:

 - rust-lang#5406 (Fix update_lints)
 - rust-lang#5409 (Downgrade let_unit_value to pedantic)
 - rust-lang#5410 (Downgrade trivially_copy_pass_by_ref to pedantic)
 - rust-lang#5412 (Downgrade inefficient_to_string to pedantic)
 - rust-lang#5415 (Add new lint for `Result<T, E>.map_or(None, Some(T))`)
 - rust-lang#5417 (Update doc links and mentioned names in docs)
 - rust-lang#5419 (Downgrade unreadable_literal to pedantic)
 - rust-lang#5420 (Downgrade new_ret_no_self to pedantic)
 - rust-lang#5422 (CONTRIBUTING.md: fix broken triage link)
 - rust-lang#5424 (Incorrect suspicious_op_assign_impl)
 - rust-lang#5425 (Ehance opt_as_ref_deref lint.)

Failed merges:

 - rust-lang#5345 (Add lint for float in array comparison)
 - rust-lang#5411 (Downgrade implicit_hasher to pedantic)
 - rust-lang#5428 (Move cognitive_complexity to nursery)

r? @ghost

changelog: rollup