Enable default features for url crate

In order to make the rust-url compatible with no_std, the crate needs to introduce a `std` feature and make it default. See servo/rust-url#831.

To reduce impact, downstream libraries should leave url's default features enabled (no other features are currently `default`).

Cargo.toml

@@ -121,7 +121,7 @@ tokio-stream = { version = "0.1", default-features = false }
 tokio-util = { version = "0.7", default-features = false }
 tracing = { version = "0.1", default-features = false }
 tracing-subscriber = { version = "0.3", default-features = false }
-url = { version = "2", default-features = false }
+url = { version = "2" }
 uuid = { version = "1", default-features = false }
 wasi-preview1-component-adapter-provider = { version = "24", default-features = false }
 wasm-tokio = { version = "0.6", default-features = false }