Adding 16.10.2, 16.9.4, 16.8.6 blog post
Add blog post for 16.10.2, 16.9.4, 16.8.6 patch release.
Patch issue: gitlab-org/release/tasks#9758 (closed)
Email Notification: https://gitlab.com/gitlab-com/gl-security/security-communications/communications/-/issues/590#note_1851918766
Copied from https://gitlab.com/gitlab-org/security/www-gitlab-com/-/merge_requests/193