Upgrade Flow in fbsource (#59359)

Summary: Pull Request resolved: #59359

Reviewed By: SamChou19815

Differential Revision: D126871744

fbshipit-source-id: af1c1197a941ed58a9fc45bea418739bb774689c

Author: generatedunixname1026736676487289

packages/react-native/src/private/webapis/structuredClone/__tests__/structuredClone-itest.js

@@ -104,6 +104,7 @@ describe('structuredClone', () => {
     const bigintValue = Object(1n);
     const bigintClone = structuredClone(bigintValue);
     expect(bigintClone).not.toBe(bigintValue);
+    // $FlowFixMe[incompatible-type]
     expect(bigintClone).toBeInstanceOf(BigInt);
     expect(bigintClone.valueOf()).toBe(1n);
   });