Updates ipnetwork to 0.21

Author: sanpii

Cargo.toml

@@ -23,7 +23,7 @@ lru = "0.16"
 # per https://serde.rs/no-std.html, "a dependency on serde_json always needs Serde built with std", which is why we do not set "default-features = false" on `serde`.
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-ipnetwork = "0.20"
+ipnetwork = "0.21"
 tokio = { version = "1", default-features = false, features = ["time"] }
 lazy_static = "1.5"