Fix breaking OSS-Fuzz coverage build

url/fuzz/Cargo.toml

@@ -9,7 +9,7 @@ publish = false
 cargo-fuzz = true
 
 [dependencies]
-libfuzzer-sys = "0.3"
+libfuzzer-sys = "0.4.0"
 
 [dependencies.url]
 path = ".."