Bump boxen from 4.2.0 to 5.0.0

Bumps [boxen](https://github.com/sindresorhus/boxen) from 4.2.0 to 5.0.0.
- [Release notes](https://github.com/sindresorhus/boxen/releases)
- [Commits](sindresorhus/boxen@v4.2.0...v5.0.0)

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

package.json

@@ -36,7 +36,7 @@
     "@octokit/rest": "^18.3.5",
     "@octokit/webhooks": "^8.5.3",
     "body-parser": "^1.19.0",
-    "boxen": "^4.2.0",
+    "boxen": "^5.0.0",
     "chalk": "^2.4.2",
     "cli-boxes": "^3.0.0",
     "commander": "^7.1.0",