Update bench/README.md with latest CW benchmark results (entry 60.2) #31

Job	Run time
test-macos	1m 8s
test-linux	1m 4s
cross-compile (aarch64-linux-gnu)	3m 21s
cross-compile (x86_64-macos-none)	3m 15s
cross-compile (aarch64-macos-none)	3m 25s
cross-compile (x86_64-linux-gnu)	3m 10s
	15m 23s

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