Canary webhooks marked as invalid

[ghost]

Serenity version: 0.11.6

Rust version: rustc 1.71.0-nightly (1a6ae3d69 2023-04-27)

Webhooks copied from discord canary are mistakenly marked as invalid. I didn't include the backtrace because it's just tokio.

Test case:

use serenity::http::Http;
use serenity::model::webhook::Webhook;

#[tokio::main]
async fn main() {
    let hook = "https://canary.discord.com/api/webhooks/id/token";

    let http = Http::new("");
    let _webhook = Webhook::from_url(&http, hook).await.expect("invalid hook");
}

[HexPandaa]

Should be fixed with #2499