Fix GH-16454: Unhandled INF in date_sunset() with tiny $utcOffset

After normalization, `N` is supposed to be in range [0, 24], but for
very large and very small `$utcOffset` this is not

Fix GH-16454: Unhandled INF in date_sunset() with tiny $utcOffset

After normalization, `N` is supposed to be in range [0, 24], but for
very large and very small `$utcOffset` this is not necessarily the
case, since the normalization might yied `-inf` or `inf`. If that
happens, we let the function fail silently, since it is highly unlikely
that such `$utcOffset`s are passed in practice.

Closes GH-16483.

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