build(deps): update brotli requirement from 3 to 6

Updates the requirements on [brotli](https://github.com/dropbox/rust-brotli) to permit the latest version.
- [Release notes](https://github.com/dropbox/rust-brotli/releases)
- [Commits](dropbox/rust-brotli@3.3.2...6.0.0)

---
updated-dependencies:
- dependency-name: brotli
  dependency-type: direct:production
...

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

Cargo.toml

@@ -70,7 +70,7 @@ rand = { version = "0.8", optional = true, features = ["small_rng"] }
 x509-parser = { version = "0.16", optional = true }
 
 # Compression
-brotli = { version = "3", optional = true }
+brotli = { version = "6", optional = true }
 flate2 = { version = "1", optional = true }
 
 # WebSockets