chore(deps): update dependency slather to v2.8.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
slather	2.8.2 -> 2.8.3

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Release Notes

SlatherOrg/slather (slather)

### [`v2.8.3`](https://togithub.com/SlatherOrg/slather/blob/HEAD/CHANGELOG.md#v283) [Compare Source](https://togithub.com/SlatherOrg/slather/compare/v2.8.2...v2.8.3) - Fix coverage_file.source_file_pathname [alfredofernandes](https://togithub.com/alfredofernandes) [#​565](https://togithub.com/SlatherOrg/slather/pull/565) - update cobertura DTD to a working URL. [jarrodlombardo-EventBase](https://togithub.com/jarrodlombardo-EventBase) [#​564](https://togithub.com/SlatherOrg/slather/pull/564)

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