message: nctl: use 2.0.0 client
diff: "external_deps": {
  "casper-client-rs": {
  "github_repo_url": "https://github.com/casper-ecosystem/casper-client-rs.git",
  - "branch": "dev"
  + "branch": "release-2.0.0"
  },
  "casper-node-launcher": {
  "github_repo_url": "https://github.com/casper-network/casper-node-launcher.git",
  