Adding 18.5.1, 18.4.3, 18.3.5 blog post
Add blog post for 18.5.1, 18.4.3, 18.3.5 patch release.
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Complete any sections of the blog post that have TODO in their content.
Security tracking issue: https://gitlab.com/gitlab-org/gitlab/-/issues/575567
Copied from https://gitlab.com/gitlab-org/security/www-gitlab-com/-/merge_requests/244