Fixed onUserInfoResponse chunks being overridden

[Nerveyyyy]

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This PR fixes the issue - 268. Where receiving a large UserInfo response it will chunk the data but override previous chunks instead of adding to it. This therefore causes issues with a partial JSON response which errors the code.

Checklist

• [x] run npm run test and npm run benchmark
• [x] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [x] commit message and code follows the Developer's Certification of Origin and the Code of conduct