Update halfbrown requirement from 0.3 to 0.4

Updates the requirements on [halfbrown](https://github.com/Licenser/halfbrown) to permit the latest version.
- [Commits](Licenser/halfbrown@v0.3.0...v0.4.0)

---
updated-dependencies:
- dependency-name: halfbrown
  dependency-version: 0.4.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.toml

@@ -16,7 +16,7 @@ simdutf8 = { version = "0.1.4", features = ["public_imp", "aarch64_neon"] }
 
 value-trait = { version = "0.11" }
 beef = { version = "0.5", optional = true }
-halfbrown = "0.3"
+halfbrown = "0.4"
 # ahash known key
 once_cell = { version = "1.21", optional = true }
 ahash = { version = "0.8", optional = true }