Rust

Update criterion requirement from 0.5 to 0.6 #174

Job	Run time
Lints	23s
Check (macos-latest, beta)	19s
Check (ubuntu-latest, beta)	18s
Check (ubuntu-latest, stable)	22s
Check (macos-latest, nightly)	22s
Check (macos-latest, stable)	27s
Test Suite (ubuntu-latest, stable)	40s
Test Suite (ubuntu-latest, nightly)	34s
Check (windows-latest, nightly)	1m 4s
Check (ubuntu-latest, nightly)	17s
Test Suite (windows-latest, stable)	1m 30s
Test Suite (macos-latest, stable)	48s
Test Suite (macos-latest, nightly)	49s
Check (windows-latest, beta)	1m 4s
Test Suite (ubuntu-latest, beta)	39s
Test Suite (macos-latest, beta)	34s
Test Suite (windows-latest, beta)	1m 38s
Test Suite (windows-latest, nightly)	1m 49s
Check (windows-latest, stable)	1m 0s
	14m 37s

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