internal/worker: increase timeout for TestTrimLargeCode
internal/worker: increase timeout for TestTrimLargeCode

TestTrimLargeCode has been timing out in CI, so the timeout is
increased.

Change-Id: Icb00ebc321c2152fef5ed94b97e0c29d03d7f15b
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/266238
Trust: Julie Qiu <8d32267b6b4884cf35adeaccde2b6857ae11aace@golang.org>
Run-TryBot: Julie Qiu <8d32267b6b4884cf35adeaccde2b6857ae11aace@golang.org>
Reviewed-by: Jonathan Amsterdam <e3d3698b2ccd5955e4adf250d0785062d0f9018b@google.com>

golang/pkgsite,golang/pkgsite,golang/pkgsite,golang/pkgsite