Update hashbrown requirement from 0.14.5 to 0.15.4

Updates the requirements on [hashbrown](https://github.com/rust-lang/hashbrown) to permit the latest version.
- [Release notes](https://github.com/rust-lang/hashbrown/releases)
- [Changelog](https://github.com/rust-lang/hashbrown/blob/master/CHANGELOG.md)
- [Commits](rust-lang/hashbrown@v0.14.5...v0.15.4)

---
updated-dependencies:
- dependency-name: hashbrown
  dependency-version: 0.15.4
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.toml

@@ -107,7 +107,7 @@ doc-comment = "0.3"
 env_logger = "0.11"
 futures = "0.3"
 half = { version = "2.2.1", default-features = false }
-hashbrown = { version = "0.14.5", features = ["raw"] }
+hashbrown = { version = "0.15.4", features = ["raw"] }
 indexmap = "2.0.0"
 itertools = "0.12"
 log = "^0.4"