Update Metadata Cache

Change-Id: I0956a525237cf29ca1a07ade8931e7eff9a56158
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3449238
diff --git a/metadata/md5-cache/dev-libs/flatbuffers-2.0.0 b/metadata/md5-cache/dev-libs/flatbuffers-2.0.0-r1
similarity index 100%
rename from metadata/md5-cache/dev-libs/flatbuffers-2.0.0
rename to metadata/md5-cache/dev-libs/flatbuffers-2.0.0-r1