pkcs1

der: remove 256 MiB limit on `Length` #3580

Job	Run time
test (stable)	28s
test (1.85.0)	35s
build (stable, wasm32-unknown-unknown)	19s
build (1.85.0, thumbv7em-none-eabi)	27s
build (stable, thumbv7em-none-eabi)	17s
build (1.85.0, wasm32-unknown-unknown)	24s
minimal-versions	-1s
	2m 29s

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