Add 12.6.3 blog post
Why is this change being made?
To promote to the public that we've released version 12.6.3 - https://gcs-12-6-3-blog-post.about.gitlab-review.app/blog/2020/01/09/gitlab-12-6-3-released/index.html
Does this MR meet the acceptance criteria?
Conformity
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Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
Edited by Mayra Cabrera