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

Compare Source

• Don't crash when 0% coverage is causing empty JSON jarrodlombardo-EventBase #​570

• Xcode 16 compatibility (as of beta 5) ksuther #​568

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