Fix: getDecodedData "to" param should be optional

[katspaugh]

It's typed as optional in the request type but not in the function signature.

(Introduced in #125.)

[github-actions]

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[usame-algan]

Thanks 🙌