Merge branch 'milestone-banner-7-02' into 'master'

Update milestone banner illustration

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144044



Merged-by: Tristan Read <tread@gitlab.com>
Approved-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>
Approved-by: Tristan Read <tread@gitlab.com>
Approved-by: Tiger Watson <twatson@gitlab.com>
Approved-by: Serhii Yarynovskyi <syarynovskyi@gitlab.com>
Approved-by: Rutger Wessels <rwessels@gitlab.com>
Co-authored-by: Julia Miocene <jmiocene@gitlab.com>