Bump octokit from 3.1.2 to 4.0.2

Bumps [octokit](https://github.com/octokit/octokit.js) from 3.1.2 to 4.0.2.
- [Release notes](https://github.com/octokit/octokit.js/releases)
- [Commits](octokit/octokit.js@v3.1.2...v4.0.2)

---
updated-dependencies:
- dependency-name: octokit
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>