fix(android): support react native 0.77

[believer]

Thanks for this great library!

Due to this change in React Native core getString now returns String?. Since the when condition checks that the current value is a string, I think it's fine to type cast the result as a String. I tested it locally and it resolves the error.

Alternatively, we could go the route of only adding the value if it exists using:

	ReadableType.String -> sizes.getString(i)?.let { result.add(it) }

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