Merge branch 'bump-k3s-gitlab-ci-to-1.28.4' into 'master'

Bump k3s version to v1.28.4-k3s2

See merge request https://gitlab.com/gitlab-org/cluster-integration/auto-deploy-image/-/merge_requests/370



Merged-by: João Alexandre Cunha <j.a.cunha@gmail.com>
Approved-by: João Alexandre Cunha <j.a.cunha@gmail.com>
Co-authored-by: Taka Nishida <tnishida@gitlab.com>