Sweep: Fix typing error when running tests with Jest

[sweep-ai]

Purpose

The purpose of this pull request is to fix the typing error that occurs when running the test suite with Jest.

Description

The issue was caused by the incorrect type definition for the RateResponse type in the src/index.ts file. The type was defined as either a single RateObj or an array of RateObj, but the test was expecting an array of RateObj.

To fix this, the RateResponse type has been updated to be an array of RateObj only. Additionally, the JSON.parse call in the returnPromise function has been updated to explicitly cast the parsed data to the correct type.

Summary

• Updated the RateResponse type to be an array of RateObj in src/index.ts
• Updated the JSON.parse call in the returnPromise function to cast the parsed data to the correct type
• This should fix the typing error that was occurring when running the test suite with Jest

Fixes #260.

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