Merge branch 'dcouture-sigstore-broken-link' into 'master'

Update Sigstore.dev broken links

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/168196



Merged-by: Marcel Amirault <mamirault@gitlab.com>
Reviewed-by: Marcel Amirault <mamirault@gitlab.com>
Co-authored-by: Dominic Couture <dcouture@gitlab.com>