chore(deps): bump commander from 4.1.1 to 6.1.0

Bumps [commander](https://github.com/tj/commander.js) from 4.1.1 to 6.1.0.
- [Release notes](https://github.com/tj/commander.js/releases)
- [Changelog](https://github.com/tj/commander.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tj/commander.js/compare/v4.1.1...v6.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

packages/create-app/package.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "@backstage/cli-common": "^0.1.1-alpha.20",
     "chalk": "^4.0.0",
-    "commander": "^4.1.1",
+    "commander": "^6.1.0",
     "fs-extra": "^9.0.0",
     "handlebars": "^4.7.3",
     "inquirer": "^7.0.4",