Merge branch 'bump-zoekt-version-to-v0.5.1' into 'master'

Bump zoekt indexer to v0.5.1

See merge request https://gitlab.com/gitlab-org/build/CNG/-/merge_requests/1772



Merged-by: Terri Chu <tchu@gitlab.com>
Approved-by: John Mason <9717668-johnmason@users.noreply.gitlab.com>
Approved-by: Terri Chu <tchu@gitlab.com>
Co-authored-by: Dmitry Gruzd <dgruzd@gitlab.com>