Upgrade redis-namespace gem

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/97476



Merged-by: Nikola Milojevic <nmilojevic@gitlab.com>
Approved-by: Max Orefice <morefice@gitlab.com>
Approved-by: Nikola Milojevic <nmilojevic@gitlab.com>
Co-authored-by: Heinrich Lee Yu <heinrich@gitlab.com>