Use ruff linter to fix issues and provide consistent formatting

server/sse_broadcaster.py

@@ -25,7 +25,7 @@ class SSEBroadcaster:
             self._handlers.discard(handler)
 
     def publish(self, value):
-         self._loop.add_callback(self._broadcast, value)
+        self._loop.add_callback(self._broadcast, value)
 
     def _broadcast(self, value):
         with self._lock:
@@ -36,4 +36,4 @@ class SSEBroadcaster:
             except Exception:
                 # Connection probably dropped, ignore and de-register the handler to stop getting future items.
                 logging.debug("Failed to push to an SSE client; dropping it")
-                self.unregister(handler)
+                self.unregister(handler)