fix: explicitly cast unspecified chrono rep type #1
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Blackhole can handle both signed int64 and unsigned integers,
but std::chrono representation type is long long, which may
vary depending on architecture where building occurs. Thus,
it may lead to ambiguous integer promotion when it's time
to format.
This commit does explicit cast to resolve ambiguity.
This should fix 3Hren#126 and 3Hren#129.