chore(deps): bump honkit from 5.1.5 to 6.1.6

Bumps [honkit](https://github.com/honkit/honkit) from 5.1.5 to 6.1.6.
- [Release notes](https://github.com/honkit/honkit/releases)
- [Changelog](https://github.com/honkit/honkit/blob/master/CHANGELOG.md)
- [Commits](https://github.com/honkit/honkit/compare/v5.1.5...v6.1.6)

---
updated-dependencies:
- dependency-name: honkit
  dependency-version: 6.1.6
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -7,7 +7,7 @@
     "chalk": "^4.1.1",
     "commander": "^7.2.0",
     "esm": "^3.0.0",
-    "honkit": "^5.1.0",
+    "honkit": "^6.1.6",
     "vuepress": "1.8.2",
     "vuepress-plugin-container": "^2.1.5",
     "vuepress-theme-hope": "^1.0.0"