Fix incorrect handling of HTTP error statuses

All non-2xx statuses were actually being ignored, because status codes
aren't propagated as errors by default.

https://phabricator.apertis.org/T8593



Signed-off-by: Ryan Gonzalez <ryan.gonzalez@collabora.com>

storage_stats/src/client.rs

@@ -54,7 +54,7 @@ impl Client {
 
         // NOTE: the URL should be printed since get() is instrumented.
         debug!("GET");
-        Ok(self.client.get(url.clone()).send().await?.bytes().await?)
+        Ok(self.client.get(url.clone()).send().await?.error_for_status()?.bytes().await?)
     }
 
     #[instrument(skip(self))]