metadata/OWNERS: Update bot owner

Update the bot owner to the shared bot owner.

BUG=b:234472251
TEST=None

Cq-Depend: chrome-internal:4796426
Change-Id: I11ec0d4caa17ed00540e2f8f0c9ed8ff99186c3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/3925035
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Auto-Submit: Alex Klein <saklein@chromium.org>
Tested-by: Alex Klein <saklein@chromium.org>
diff --git a/metadata/OWNERS b/metadata/OWNERS
index 6bc6027..f6773ed 100644
--- a/metadata/OWNERS
+++ b/metadata/OWNERS
@@ -1,2 +1,2 @@
 # Bot that commits cache updates.
-chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com
+include chromiumos/owners:v1:/bots/OWNERS.metadata_cache