Merge branch 'andrewk-update-security-dev-template' into 'master'

Adds a breaking change checklist item

See merge request gitlab-org/gitlab!84402

.gitlab/issue_templates/Security developer workflow.md

@@ -44,6 +44,7 @@ After your merge request has been approved according to our [approval guidelines
 - [ ] Fill in any upgrade notes that users may need to take into account in the [details section](#details)
 - [ ] Add Yes/No and further details if needed to the migration and settings columns in the [details section](#details)
 - [ ] Add the nickname of the external user who found the issue (and/or HackerOne profile) to the Thanks row in the [details section](#details)
+- [ ] If this includes a breaking change, make sure it is mentioned for the relevant versions in [`doc/update/index.md`](https://gitlab.com/gitlab-org/security/gitlab/-/blob/master/doc/update/index.md#version-specific-upgrading-instructions)
 
 ## Summary