Upgrade Review Apps chart version to 3.2.0
Changelog: https://gitlab.com/gitlab-org/charts/gitlab/-/blob/master/CHANGELOG.md#320-2020-03-22
Noticeable item from 3.1.0: gitlab-org/charts/gitlab!1157 (merged)
Changelog: https://gitlab.com/gitlab-org/charts/gitlab/-/blob/master/CHANGELOG.md#320-2020-03-22
Noticeable item from 3.1.0: gitlab-org/charts/gitlab!1157 (merged)