Fix: Fixed an issue where adding session variables multiple times would overwrite them. (#11308)

### What problem does this PR solve?

Fix: Fixed an issue where adding session variables multiple times would
overwrite them.
### Type of change

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

web/src/pages/agent/gobal-variable-sheet/hooks/use-form.tsx

@@ -15,7 +15,8 @@ export const useHandleForm = () => {
       return value;
     }
   };
-  const handleSubmit = useCallback(async (fieldValue: FieldValues) => {
+  const handleSubmit = useCallback(
+    async (fieldValue: FieldValues) => {
       const param = {
         ...(data.dsl?.variables || {}),
         [fieldValue.name]: {
@@ -35,7 +36,9 @@ export const useHandleForm = () => {
       if (res.code === 0) {
         refetch();
       }
-  }, []);
+    },
+    [data.dsl?.variables, refetch, saveGraph],
+  );
 
   return { handleSubmit, loading };
 };