Update criterion requirement from 0.7 to 0.8 #1350

Job	Run time
coverage	1m 5s
lint (nightly)	29s
ci (stable)	26s
ci (stable, --no-default-features, true)	24s
ci (1.83.0)	15s
ci (beta, --no-default-features --features std)	26s
ci (stable, --no-default-features --features std)	23s
ci (beta)	28s
ci (nightly, -Z direct-minimal-versions)	26s
ci (nightly, --no-default-features --features std)	27s
ci (nightly)	29s
	5m 18s

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