Update links in Deprecations MR template
What does this MR do and why?
Update handbook and docs links in https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/merge_request_templates/Deprecations.md
Some anchors have changed, so the links go to the top of the page, and with huge pages like https://about.gitlab.com/handbook/marketing/blog/release-posts/, this is inefficient.
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.