[Backport prod-2-9-advance] Update vars.yaml

[geo-ghci-int]

Backport of #1683 to prod-2-9-advance

Error on cherry-picking: b289315

To continue do:

git fetch && \
  git checkout ghci/backport/1683-to-prod-2-9-advance && \
  git reset --hard HEAD^ && \
  git cherry-pick b289315aa69119be3f2433314924ad262ccfa43c
git push origin ghci/backport/1683-to-prod-2-9-advance --force