jose-jwk: add support for `p521` (#62) #93

Job	Run time
no_std (1.65.0, thumbv7em-none-eabi)	3m 57s
no_std (1.65.0, wasm32-unknown-unknown)	4m 4s
no_std (stable, thumbv7em-none-eabi)	18s
no_std (stable, wasm32-unknown-unknown)	19s
test (1.65.0)	4m 0s
test (stable)	18s
minimal-versions / minimal-versions	29s
	13m 25s

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