chore: remove unused rustc-hash dep

Author: yannham

Cargo.lock

@@ -45,7 +45,6 @@ libdd-tinybytes = { version = "1.1.1", path = "../libdd-tinybytes", features = [
     "serialization",
 ] }
 indexmap = "2.11"
-rustc-hash = "2"
 
 # Compression feature
 flate2 = { version = "1.0", optional = true }