fix(deps): update dependency sitemap to v8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sitemap	^7.1.2 -> ^8.0.0

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Release Notes

ekalinin/sitemap.js (sitemap)

### [`v8.0.0`](https://togithub.com/ekalinin/sitemap.js/blob/HEAD/CHANGELOG.md#800) [Compare Source](https://togithub.com/ekalinin/sitemap.js/compare/7.1.2...8.0.0) - fix [#​423](https://togithub.com/ekalinin/sitemap.js/issues/423) via [#​424](https://togithub.com/ekalinin/sitemap.js/issues/424) thanks [@​huntharo](https://togithub.com/huntharo) - Propagate errors in SitemapAndIndexStream - drop node 12 support

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