fix: after logging out and entering the knowledge base page again, the data before still exists #1306 (#1597)

### What problem does this PR solve?

fix: after logging out and entering the knowledge base page again, the
data before still exists #1306
### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/hooks/flow-hooks.ts

@@ -96,6 +96,7 @@ export const useFetchFlow = (): {
     refetchOnReconnect: false,
     refetchOnMount: false,
     refetchOnWindowFocus: false,
+    gcTime: 0,
     queryFn: async () => {
       const { data } = await flowService.getCanvas({}, id);