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der: refactor `Header::peek` (#1480) #3056

Job	Run time
build (1.72.0, thumbv7em-none-eabi)	36s
build (1.72.0, wasm32-unknown-unknown)	36s
build (stable, thumbv7em-none-eabi)	40s
build (stable, wasm32-unknown-unknown)	42s
minimal-versions	0s
test (1.72.0)	1m 14s
test (stable)	1m 11s
	4m 59s

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