fix(cli): requiresRefresh function does not respect null

[kaizencc]

This function should also respect expiration: null, I think, but also I don't believe this fixes the ultimate issue of #32653. Just a guess at this point.

The function docs are as follows:

@param requiresRefresh
A function that will evaluate the resolved value and determine if it represents static value or one that will eventually need to be refreshed. For example, AWS credentials that have no defined expiration will never need to be refreshed, so this function would return true if the credentials resolved by the underlying provider had an expiration and false otherwise.

Since we are respecting null as a valid expiration just like undefined in credentialsAboutToExpire, we should also respect it here.

Underlying memoize function is this one: https://github.com/smithy-lang/smithy-typescript/blob/main/packages/property-provider/src/memoize.ts#L27

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.64%. Comparing base (982be5c) to head (e7b322d).
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Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32666   +/-   ##
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  Coverage   80.64%   80.64%           
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  Files         107      107           
  Lines        6996     6996           
  Branches     1290     1290           
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  Hits         5642     5642           
  Misses       1175     1175           
  Partials      179      179           

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