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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Configuration

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⚡️ Lighthouse report:	Category	Score
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Quality Gate passed

Issues
0 New issues
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Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.26%. Comparing base (9a10be1) to head (96b32f5).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1772 +/- ## ======================================= Coverage 98.26% 98.26% ======================================= Files 23 23 Lines 173 173 Branches 31 31 ======================================= Hits 170 170 Misses 3 3 ```

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