Grant abandon to chromeos-prod-bot

PUpr jobs sometimes try and abandon previous CLs.

Bug: b/406133835

Change-Id: I62838094ef8f72301b15a3b3c064c71c3d428bed
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/+/6394597
Reviewed-by: Mike Frysinger <vapier@chromium.org>

project.config

diff --git a/project.config b/project.config
index 14ade40..c92c4dc 100644
--- a/project.config
+++ b/project.config
@@ -73,6 +73,7 @@
 	label-Auto-Submit = +0..+1 group Change Owner
 	label-Bot-Commit = +0..+1 group chromeos-bots
 	abandon = group chromeos-committer-approvers
+	abandon = group chromeos-prod-bot
 	viewPrivateChanges = group chromeos-bots
 	viewPrivateChanges = group chromeos-build-owners
 	editTopicName = group chromeos-committers