der: const GeneralizedTime::from_date_time #2326

Job	Run time
build (1.81.0, wasm32-unknown-unknown)	53s
test (stable)	2m 25s
build (stable, thumbv7em-none-eabi)	42s
build (1.81.0, thumbv7em-none-eabi)	52s
test (1.81.0)	2m 30s
fuzz	2m 16s
build (stable, wasm32-unknown-unknown)	45s
minimal-versions	0s
	10m 23s

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