Update perfect hashing crate

Signed-off-by: Sean Young <sean@mess.org>

Cargo.toml

@@ -30,7 +30,7 @@ serde = "1.0"
 serde_derive = { version = "1.0" }
 inkwell = { version = "0.1.0-beta.2", features = ["target-webassembly", "target-bpf", "llvm11-0"] }
 blake2-rfc = "0.2.18"
-phf = { version = "0.8", features = ["macros"] }
+phf = { version = "0.9", features = ["macros"] }
 unicode-xid = "0.2.0"
 handlebars = "3.4"
 contract-metadata = "0.2.0"