x509-cert: use `BuilderProfile` for consistency (#1517) #1372

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	2m 0s
test (1.65.0)	2m 11s
build (1.65.0, wasm32-unknown-unknown)	1m 56s
test (stable)	29s
build (stable, thumbv7em-none-eabi)	20s
build (stable, wasm32-unknown-unknown)	17s
minimal-versions / minimal-versions	42s
	7m 55s

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