Bump @octokit/core from 3.5.1 to 5.0.0

Bumps [@octokit/core](https://github.com/octokit/core.js) from 3.5.1 to 5.0.0.
- [Release notes](https://github.com/octokit/core.js/releases)
- [Commits](octokit/core.js@v3.5.1...v5.0.0)

---
updated-dependencies:
- dependency-name: "@octokit/core"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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