Update to itertools 0.12

Author: sdroege

Cargo.toml

@@ -13,7 +13,7 @@ documentation = "https://docs.rs/av1-grain"
 [dependencies]
 anyhow = "1.0.58"
 arrayvec = "0.7.2"
-itertools = { version = "0.11", optional = true }
+itertools = { version = "0.12", optional = true }
 log = "0.4.17"
 nom = { version = "7.1.1", optional = true }
 num-rational = { version = "0.4.1", optional = true }