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Bump `pkcs1` to v0.8.0-rc.5 release (#712) #1322

Job	Run time
nightly	1m 7s
build (1.85.0, wasm32-unknown-unknown)	22s
build (stable, thumbv7em-none-eabi)	24s
test (1.85.0)	3m 21s
build (stable, wasm32-unknown-unknown)	22s
build (1.85.0, thumbv7em-none-eabi)	21s
test (stable)	4m 47s
minimal-versions	-1s
	10m 43s