Bump doctoc from 1.4.0 to 2.1.0

Bumps [doctoc](https://github.com/thlorenz/doctoc) from 1.4.0 to 2.1.0.
- [Release notes](https://github.com/thlorenz/doctoc/releases)
- [Commits](https://github.com/thlorenz/doctoc/commits)

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

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

Author: dependabot[bot]

package-lock.json

@@ -45,7 +45,7 @@
     "@types/mri": "^1.1.0",
     "@types/node": "^14.0.1",
     "@types/tar": "^4.0.3",
-    "doctoc": "^1.4.0",
+    "doctoc": "^2.1.0",
     "dotenv": "^11.0.0",
     "fs-extra": "^9.0.0",
     "mocha": "^8.0.1",