Update Metadata Cache

Cr-Build-Url: https://cr-buildbucket.appspot.com/build/8699641023786870337
Change-Id: I9a47a78444fec451f1d1f47e6c64b7c2700ce2ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/7097850
Bot-Commit: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>