Use Ruff and fix all its warnings and errors

discord_rss_bot/healthcheck.py

@@ -7,14 +7,15 @@ def healthcheck() -> None:
     """Check if the website is up.
 
     sys.exit(0): success - the container is healthy and ready for use.
-    sys.exit(1): unhealthy - the container is not working correctly."""
+    sys.exit(1): unhealthy - the container is not working correctly.
+    """
     # TODO: We should check more than just that the website is up.
     try:
         r: requests.Response = requests.get(url="http://localhost:5000", timeout=5)
         if r.ok:
             sys.exit(0)
     except requests.exceptions.RequestException as e:
-        print(f"Healthcheck failed: {e}", file=sys.stderr)
+        print(f"Healthcheck failed: {e}", file=sys.stderr)  # noqa: T201
         sys.exit(1)