Apply duration_suboptimal_units lint findings (#7144)

Quote from lint description:
"Using a smaller unit for a duration that is evenly divisible by a larger unit reduces readability. Readers have to mentally convert values, which can be error-prone and makes the code less clear."

src/api/core/sends.rs

@@ -574,7 +574,7 @@ async fn download_url(host: &Host, send_id: &SendId, file_id: &SendFileId) -> Re
 
         Ok(format!("{}/api/sends/{send_id}/{file_id}?t={token}", &host.host))
     } else {
-        Ok(operator.presign_read(&format!("{send_id}/{file_id}"), Duration::from_secs(5 * 60)).await?.uri().to_string())
+        Ok(operator.presign_read(&format!("{send_id}/{file_id}"), Duration::from_mins(5)).await?.uri().to_string())
     }
 }
 

src/api/core/two_factor/webauthn.rs

@@ -38,7 +38,7 @@ static WEBAUTHN: LazyLock<Webauthn> = LazyLock::new(|| {
     let webauthn = WebauthnBuilder::new(&rp_id, &rp_origin)
         .expect("Creating WebauthnBuilder failed")
         .rp_name(&domain)
-        .timeout(Duration::from_millis(60000));
+        .timeout(Duration::from_mins(1));
 
     webauthn.build().expect("Building Webauthn failed")
 });