Release branches fail CTS checks in CI if CTS is updated in trunk #8313
Description
RE: CI issues noticed by @aleiserson after merging #8311 (comment link):
(The problem is that I bumped the CTS version on trunk earlier today, and the CTS is cloned with
--depth 1. So the cache from trunk will not work for the v27 branch. Certainly there's a better fix but changing the tag should suffice for now.)