Bump minimum ahash version to 0.2.9

Author: Amanieu

Cargo.toml

@@ -14,7 +14,7 @@ build = "build.rs"
 
 [dependencies]
 # For the default hasher
-ahash = { version = "0.2", optional = true }
+ahash = { version = "0.2.9", optional = true }
 
 # For external trait impls
 rayon = { version = "1.0", optional = true }