rustdoc: items in deprecated modules should count as deprecated for search ranking

[lolbinarycat]

reproduction steps

1. open standard library docs
2. search u32 -> Option<char> or char::from_u32

expected outcome

deprecated std::char::from_u32 shows after all the associated methods of char.

actual outcome

std::char::from_u32 is the first result.

rustdoc version

rustdoc 1.89.0-nightly (255aa2208 2025-06-19)