Update ammonia from 3.3.0 to 4.0.0

Author: ehuss

Cargo.lock

@@ -50,7 +50,7 @@ warp = { version = "0.3.6", default-features = false, features = ["websocket"],
 
 # Search feature
 elasticlunr-rs = { version = "3.0.2", optional = true }
-ammonia = { version = "3.3.0", optional = true }
+ammonia = { version = "4.0.0", optional = true }
 
 [dev-dependencies]
 assert_cmd = "2.0.11"