der: const GeneralizedTime::from_date_time (#1718) #1634

Job	Run time
test (stable)	25s
build (1.85.0, wasm32-unknown-unknown)	16s
build (1.85.0, thumbv7em-none-eabi)	19s
build (stable, wasm32-unknown-unknown)	11s
build (stable, thumbv7em-none-eabi)	27s
test (1.85.0)	28s
minimal-versions / minimal-versions	29s
	2m 35s

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