Announce deprecation of bundler-audit
### Problem to solve `bundler-audit` will be deprecated in `15.0` and this deprecation has to be announced. ### Proposal Warn users about this deprecation in the analyzer itself and the DS documentation. ### Implementation plan - [x] update Dependency Scanning docs with a warning about deprecation (https://gitlab.com/gitlab-org/gitlab/-/merge_requests/76408) - [x] update the `bundler-audit` analyzer with a warning in the job output (https://gitlab.com/gitlab-org/security-products/analyzers/bundler-audit/-/merge_requests/88) - [x] have deprecation release post in 14.6 announcing deprecation and if users customized yml to update it and coverage is continued through gemnasium (https://gitlab.com/gitlab-org/gitlab/-/merge_requests/76191) - [x] Include in "SCA deprecations" overview blog post (https://gitlab.com/gitlab-com/www-gitlab-com/-/merge_requests/95044) - [x] communicate to support slack channels and link to issue
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