Fix try M83 pool.

Bug: 1067999
Change-Id: I4cd7cd268e9e7d5cb799e106b92130ddf0fc9d89
No-Try: true
TBR: agable@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2137517Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756764}

infra/config/versioned/milestones/m83/buckets/try.star

@@ -4,7 +4,7 @@ load('//lib/try.star', 'try_')
 # need to be changed when making a new milestone
 load('../vars.star', 'vars')
 
-defaults.pool.set('lui.chromium.try-m83')
+defaults.pool.set('lui.chromium.try')
 
 luci.bucket(
     name = vars.try_bucket,