chore(deps): update dependency octokit to v4.0.3 (#666)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [octokit](https://redirect.github.com/octokit/octokit.js) | [`4.0.2`
-> `4.0.3`](https://renovatebot.com/diffs/npm/octokit/4.0.2/4.0.3) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/octokit/4.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/octokit/4.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/octokit/4.0.2/4.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/octokit/4.0.2/4.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>octokit/octokit.js (octokit)</summary>

###
[`v4.0.3`](https://redirect.github.com/octokit/octokit.js/releases/tag/v4.0.3)

[Compare
Source](https://redirect.github.com/octokit/octokit.js/compare/v4.0.2...v4.0.3)

##### Bug Fixes

- **deps:** bump `@octokit/app` and `@octokit/types`
([#&#8203;2763](https://redirect.github.com/octokit/octokit.js/issues/2763))
([33d03d9](https://redirect.github.com/octokit/octokit.js/commit/33d03d9ede478b425254dc9882cb7078622cd189))

</details>

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