Update dependency guard to v2.19.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
guard (source)	2.18.1 -> 2.19.0

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Release Notes

guard/guard (guard)

### [`v2.19.0`](https://redirect.github.com/guard/guard/releases/tag/v2.19.0) [Compare Source](https://redirect.github.com/guard/guard/compare/v2.18.1...v2.19.0) #### What's Changed - [Drop unused require ostruct](https://redirect.github.com/guard/guard/commit/1f8cac318e8aac03ca6f307bc653ac542d0162ff) **Full Changelog**: https://github.com/guard/guard/compare/v2.18.1...v2.19.0

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Configuration

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