Replace fxhash with rustc-hash

[james7132]

Checklist

• Run cargo clippy.
• Run RUSTFLAGS=--cfg=web_sys_unstable_apis cargo clippy --target wasm32-unknown-unknown if applicable.
• Add change to CHANGELOG.md. See simple instructions inside file.

Connections
Fixes #3369.

Description
Changes all dependencies that currently depend on fxhash to use rustc-hash instead, which should be a drop-in replacement that is both maintained and hit 1.0. Brings it into line with naga, which is using rustc-hash.

Testing
All of the crates in the workspace build properly.

[cwfitzgerald]

Nice!

[cwfitzgerald]

Format mad

[brody4hire]

Quoting a note I added to #6999 for the record on this update (apologies in advance for all the notes spam):

• Both fxhash and rustc-hash are in the dependency tree #3369 / PR Replace fxhash with rustc-hash #3502 - it looks to me like the old fxhash crate was some kind of copy of the hasher from rustc-hash. I think it was 100% 200% correct to drop use of the old fxhash in favor of rustc-hash. My one issue with rustc-hash is that it seems to contain both FxHasher, which can be used with hashbrown, and FxHashMap / FxHashSet typedefs which are hard-coded to using std::collections. So moving forward, we should use rustc_hash::FxHasher but not rustc_hash::FxHashMap or rustc_hash::FxHashSet.