build(deps): bump @octokit/core from 3.1.1 to 3.1.2

Bumps [@octokit/core](https://github.com/octokit/core.js) from 3.1.1 to 3.1.2.
- [Release notes](https://github.com/octokit/core.js/releases)
- [Commits](octokit/core.js@v3.1.1...v3.1.2)

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