chore(deps): update dependency slather to v2.8.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
slather	2.8.3 -> 2.8.4

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Release Notes

SlatherOrg/slather (slather)

### [`v2.8.4`](https://redirect.github.com/SlatherOrg/slather/blob/HEAD/CHANGELOG.md#v284) [Compare Source](https://redirect.github.com/SlatherOrg/slather/compare/v2.8.3...v2.8.4) - Don't crash when 0% coverage is causing empty JSON [jarrodlombardo-EventBase](https://redirect.github.com/jarrodlombardo-EventBase) [#​570](https://redirect.github.com/SlatherOrg/slather/pull/570) - Xcode 16 compatibility (as of beta 5) [ksuther](https://redirect.github.com/ksuther) [#​568](https://redirect.github.com/SlatherOrg/slather/pull/568)

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