[14.6] Fix cache key for QA gems for Debian buster
Picked from !80654 (merged) for %14.7
What does this MR do and why?
In !80362 (merged) we
bumped the CI images from Debian buster to bullseye. We bumped the
cache key for everything but the QA gems, which appear to be cached in
the setup-test-env.
Since Debian bullseye uses libc 2.29 but buster uses 2.28, this led to
errors in the 14-6-stable-ee branch running C extensions compiled
against the former (https://gitlab.com/gitlab-org/security/gitlab/-/jobs/2110775809).
To avoid this problem in the short-term, bump the cache key in
14-7-stable-ee while we also update the cache key in master(!80656 (merged)).
MR acceptance checklist
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Edited by Markus Koller