cmd/bench: run go tests 6 times

benchstat wants 95% CI by default, which requires at least 6 samples.

Change-Id: I250255b4d7860892de330e31269184b5e97bc7a6
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/623641
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
1 file changed