Merge branch 'upgrade-pages-to-v1.6.1' into 'master'

Upgrade pages to v1.6.1

Closes gitlab-pages#228

See merge request gitlab-org/gitlab-ce!29559

(cherry picked from commit 95c16e48)

cca88253 Update GitLab Pages to v1.6.1

GITLAB_PAGES_VERSION

-1.6.0
+1.6.1

changelogs/unreleased/upgrade-pages-to-v1-6-1.yml

+---
+title: Update GitLab Pages to v1.6.1
+merge_request: 29559
+author:
+type: other