Update criterion requirement from 0.5 to 0.6 #221

Job	Run time
Rustfmt	33s
Builds (ubuntu-22.04, aarch64-linux-android)	1m 39s
Test Suite (stable)	4m 15s
Builds (ubuntu-22.04, x86_64-unknown-linux-musl)	1m 32s
Bench (current, refs/pull/202/merge)	3m 52s
Test Suite (beta)	4m 8s
Bench (base, main)	4m 1s
Builds (ubuntu-22.04, wasm32-unknown-unknown, --features wasm --no-default-features)	1m 21s
Test Suite (1.85.0)	3m 58s
Builds (macos-13, aarch64-apple-ios)	1m 56s
Builds (macos-13, x86_64-apple-darwin)	1m 56s
Builds (macos-14, aarch64-apple-darwin)	1m 12s
Builds (windows-2019, x86_64-pc-windows-msvc)	3m 9s
Upload benchmark results	1m 0s
	34m 32s

Provide feedback