Migrate OWNERS to the sdk infra team.

Bug: b/323834062
Change-Id: Ia0ff6c1c39722dcbc1f1c5537a88a99a643ab46f
Reviewed-on: https://dart-review.googlesource.com/c/deps/+/351081
Commit-Queue: Jonas Termansen <sortie@google.com>
Reviewed-by: William Hesse <whesse@google.com>
diff --git a/OWNERS b/OWNERS
index 463169b..5b51b39 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1 +1 @@
-file:dart-internal:main:/OWNERS
+file:sdk:main:/tools/OWNERS_INFRA