Merge branch '521159-add-pg17-specs' into 'master'

Add PG 17 to nightly rspec builds

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/182730



Merged-by: Lin Jen-Shin <jen-shin@gitlab.com>
Approved-by: Lin Jen-Shin <jen-shin@gitlab.com>
Reviewed-by: Lin Jen-Shin <jen-shin@gitlab.com>
Co-authored-by: Leonardo Rosa <ldarosa@gitlab.com>