OWNERS: add ukai for cipd_manifest.*

goma team will release goma client cipd in depot_tools,
by modifying cipd_manifest.txt and cipd_manifest.versions

add ukai as OWNERS so that goma cilent release won't need
to wait for review.

Change-Id: I7f49d9c07b23d18c4a05ab11bea855d3f557a6ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2024208
Auto-Submit: Fumitoshi Ukai <ukai@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@google.com>
Reviewed-by: Andrii Shyshkalov <tandrii@google.com>

OWNERS

@@ -26,4 +26,7 @@ per-file cros=file://CROS_OWNERS
 per-file cros_sdk=file://CROS_OWNERS
 per-file repo=file://CROS_OWNERS
 
+# for goma client update
+per-file cipd_manifest.*=ukai@google.com
+
 # COMPONENT: Infra>SDK