build(deps-dev): bump @octokit/core from 3.1.3 to 3.1.4

Bumps [@octokit/core](https://github.com/octokit/core.js) from 3.1.3 to 3.1.4.
- [Release notes](https://github.com/octokit/core.js/releases)
- [Commits](octokit/core.js@v3.1.3...v3.1.4)

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Author: dependabot[bot]