Update to hashbrown 0.15.2.

Author: sunfishcode

Cargo.toml

@@ -41,7 +41,7 @@ no-std = ["hashbrown", "ahash"]
 bytes = { version = "1", default-features = false }
 fnv = { version = "1.0.5", default-features = false }
 itoa = "1"
-hashbrown = { version = "0.12.0", optional = true }
+hashbrown = { version = "0.15.2", optional = true }
 ahash = { version = "0.8.6", default-features = false, optional = true }
 
 [dev-dependencies]