Clean up post-merge lint

I am a *bit* sorry for this commit, because ideally this would've been
folded into 6d50b1c2c7 and whatever the
source of the other "conflict" was.

However, as the things have been merged in a batch, I can't do much more
than this.

snikket_web/main.py

@@ -99,7 +99,7 @@ async def about() -> str:
         version = _version.version
         try:
             core_versions["Prosody"] = await client.get_server_version()
-        except quart.exceptions.Unauthorized:
+        except werkzeug.exceptions.Unauthorized:
             core_versions["Prosody"] = "unknown"
 
     if current_app.debug: