Merge branch 'morefice/bump-pg-query-v6' into 'master'

Bump pg_query v6.0.0

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/174865



Merged-by: Stan Hu <stanhu@gmail.com>
Approved-by: Stan Hu <stanhu@gmail.com>
Co-authored-by: Maxime Orefice <morefice@gitlab.com>