Specify only luci buckets instead of hardcoding trybot names

I verified that this works

NoTry: true
Bug: skia:9639
Change-Id: Iacc0a865330c2049c8c124365122aa16c4493746
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/254676
Commit-Queue: Ravi Mistry <rmistry@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
1 file changed