Bump ipnetwork from 0.20.0 to 0.21.0 (#734)

Author: dependabot[bot]

Cargo.lock

@@ -9,7 +9,7 @@ serde = "1.0.217"
 serde_json = "1.0.134"
 
 [build-dependencies]
-ipnetwork = { version = "0.20.0", features = ["schemars"] }
+ipnetwork = { version = "0.21.0", features = ["schemars"] }
 prettyplease = "0.2.25"
 schemars = "0.8.21"
 serde = "1.0.217"