message: deps: update to 3.0.0
diff: },
  "devDependencies": {
  "@cybozu/eslint-config": "^4.0.1",
  - "@kintone/plugin-packer": "^1.1.0-alpha.0",
  + "@kintone/plugin-packer": "^3.0.0",
  <% if (enablePluginUploader) { %>
  "@kintone/plugin-uploader": "^2.4.8",
  "npm-run-all": "^4.1.5",
  