cmd/bench: increase timeout for gopls tests to 180m

With recently added benchmarks, gopls benchmarks are starting to time
out.

Increase to 180m for now; we'll revisit if the benchmarks can be made
faster.

Change-Id: I2f60a8b606bebaaffac347173bdd064646e2a5fc
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/530915
Auto-Submit: Robert Findley <rfindley@google.com>
Reviewed-by: Nooras Saba‎ <saba@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
1 file changed