Update blake3 from 1.8.3 to 1.8.4

Summary:
Release notes:
https://github.com/BLAKE3-team/BLAKE3/releases/tag/1.8.4

No change needed in the ffi_neon.rs overlay.

Reviewed By: JakobDegen

Differential Revision: D115287838

fbshipit-source-id: 427d0a5f3e8fda4cce98b2aba34f3c5b37ee2f27

Author: David Tolnay

shed/fsiomicrobench/Cargo.toml

@@ -11,6 +11,6 @@ license = "MIT OR Apache-2.0"
 
 [dependencies]
 anyhow = "1.0.104"
-blake3 = { version = "=1.8.3", features = ["mmap", "rayon", "traits-preview"] }
+blake3 = { version = "=1.8.4", features = ["mmap", "rayon", "traits-preview"] }
 clap = { version = "4.6.2", features = ["derive", "env", "string", "unicode", "wrap_help"] }
 rand = "0.10.2"