fix: linter warnings

[Kikobeats]

These changes are motivated by Next.js linter:

$ npx next lint

./src/index.js
101:6  Warning: React Hook useCallback has missing dependencies: 'apiUrlProps', 'fetchData', and 'mergeData'. Either include them or remove the dependency array.  react-hooks/exhaustive-deps
101:38  Warning: React Hook useCallback has a complex expression in the dependency array. Extract it to a separate variable so it can be statically checked.  react-hooks/exhaustive-deps
156:5  Warning: React Hook useCallback has a missing dependency: 'updateState'. Either include it or remove the dependency array.  react-hooks/exhaustive-deps
159:3  Warning: React Hook useEffect has a missing dependency: 'toFetchData'. Either include it or remove the dependency array.  react-hooks/exhaustive-deps

Related: https://github.com/microlinkhq/sdk/pull/297/files

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Name	Status	Preview	Comments	Updated
sdk-hover-react	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Jan 8, 2023 at 11:03AM (UTC)
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sdk-vanilla	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Jan 8, 2023 at 11:03AM (UTC)

[Kikobeats]

@breadadams can you please take a look? I don't want to break nothing 😬

[breadadams]

Lgtm!