Update New Version of gitlab-styles.md
What does this MR do and why?
This MR includes a checklist for the author to remember to announce when a new version of GitLab Styles is used in GitLab.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.