Fix msrv.

Cargo.toml

@@ -20,7 +20,7 @@ categories = ["no-std", "embedded", "wasm", "parser-implementations"]
 [dependencies]
 smallvec = { version = "1.7.0", default-features = false, features = ["union", "const_new", "const_generics"] }
 thin-vec = { version = "0.2.13", default-features = false }
-ahash = { version = "0.8.2", default-features = false, features = ["compile-time-rng"] }
+ahash = { version = "0.8.2,<=0.8.7", default-features = false, features = ["compile-time-rng"] }                # `ahash` bumps MSRV to 1.72 from 0.8.8 onwards
 num-traits = { version = "0.2.0", default-features = false }
 once_cell = { version = "1.7.0", default-features = false, features = ["race"] }
 bitflags = { version = "2.0.0", default-features = false }