Bump sphinx-sitemap from 2.7.2 to 2.8.0 in /docs/sphinx (#5192)

Bumps [sphinx-sitemap](https://github.com/jdillard/sphinx-sitemap) from 2.7.2 to 2.8.0.
- [Release notes](https://github.com/jdillard/sphinx-sitemap/releases)
- [Changelog](https://github.com/jdillard/sphinx-sitemap/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/jdillard/sphinx-sitemap/compare/v2.7.2...v2.8.0)

---
updated-dependencies:
- dependency-name: sphinx-sitemap
  dependency-version: 2.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs/sphinx/requirements.txt

@@ -234,7 +234,7 @@ sphinx-notfound-page==1.1.0
     # via rocm-docs-core
 sphinx-reredirects==0.1.6
     # via -r requirements.in
-sphinx-sitemap==2.7.2
+sphinx-sitemap==2.8.0
     # via -r requirements.in
 sphinxcontrib-applehelp==2.0.0
     # via sphinx