Bump got and nodemon in /javascript/webhooks-nodejs

Removes [got](https://github.com/sindresorhus/got). It's no longer used after updating ancestor dependency [nodemon](https://github.com/remy/nodemon). These dependencies need to be updated together.


Removes `got`

Updates `nodemon` from 2.0.16 to 2.0.20
- [Release notes](https://github.com/remy/nodemon/releases)
- [Commits](remy/nodemon@v2.0.16...v2.0.20)

---
updated-dependencies:
- dependency-name: got
  dependency-type: indirect
- dependency-name: nodemon
  dependency-type: direct:production
...

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Author: dependabot[bot]