kminion: upgrade kminion to 2.3.0, bump chart to 0.15.0#1726

sbocinec merged 3 commits intoredpanda-data:mainredpanda-data/helm-charts:mainfrom

sbocinec:st/kminion-2-3-0sbocinec/redpanda-helm-charts:st/kminion-2-3-0Copy head branch name to clipboard