chore: bump 8 tool versions to latest release

kubecolor 0.5.3 -> 0.6.0, stern 1.33.1 -> 1.34.0, helm 4.1.3 -> 4.2.0, terraform 1.14.8 -> 1.15.0, skaffold 2.18.2 -> 2.21.0, kubeseal 0.36.1 -> 0.37.0, lazydocker 0.25.0 -> 0.25.2, kubelogin 0.2.16 -> 0.2.17

feat: update all tools to 2026 versions, helm 4, cgroup v2 docs

feat: add nginx-ingress howto

chore: update readme

fix: kube-shell and krew installation

chore: update gitignore

feat: update install script

chore: merge with main

feat: update packages

feat: update packages