Remove unwrap in PYM::epoch_ns_for_utc (#701) #2177

Job	Run time
Test feature matrix	12m 1s
MSRV	23s
Test FFI (stable, ubuntu-latest)	26s
Lint	47s
Test (stable, macos-latest)	31s
Test (stable, ubuntu-latest)	21s
Documentation	21s
Test (stable, windows-latest)	1m 30s
	16m 20s

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