bug: obs incorrect signature error when using huawei.com

[FayeSpica]

Describe the bug

got incorrect signature error when using obs.xxx.huawei.com as endpoint

Steps to Reproduce

#[tokio::main]
async fn main() {
    let builder = opendal::services::Obs::default()
        .bucket("test-bucket")
        .endpoint("https://obs.xxx.huawei.com")
        .access_key_id("ak")
        .secret_access_key("sk");
    let operator = opendal::Operator::new(builder).unwrap().finish();
    println!("{:#?}", operator.list("").await.unwrap());
}

Expected Behavior

list objects successfully.

Additional Context

No response

Are you willing to submit a PR to fix this bug?

• Yes, I would like to submit a PR.