fix(deps): update dependency probot to v9.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
probot (source)	dependencies	minor	9.3.4 -> 9.4.0

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Release Notes

probot/probot

### [`v9.4.0`](https://togithub.com/probot/probot/releases/v9.4.0) [Compare Source](https://togithub.com/probot/probot/compare/v9.3.4...v9.4.0) ##### Features - add LOG_LEVEL_IN_STRING to set bunyan-format levelInString option ([#​1015](https://togithub.com/probot/probot/issues/1015)) ([bf354ff](https://togithub.com/probot/probot/commit/bf354ff))

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