chore(deps): update dependency probot to v12.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
probot (source)	12.3.4 -> 12.4.0

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Release Notes

probot/probot (probot)

### [`v12.4.0`](https://togithub.com/probot/probot/releases/tag/v12.4.0) [Compare Source](https://togithub.com/probot/probot/compare/v12.3.4...v12.4.0) ##### Features - set `x-github-delivery` header to `event.id` for all requests sent from `context.octokit` in event handlers ([#​2026](https://togithub.com/probot/probot/issues/2026)) ([f1985e5](https://togithub.com/probot/probot/commit/f1985e53c818aa0369f4f2d6fb1e5e7eb7bbd3e8))

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