tools: bump unist-util-visit in /tools/doc in the doc group

Bumps the doc group in /tools/doc with 1 update: [unist-util-visit](https://github.com/syntax-tree/unist-util-visit).

Updates `unist-util-visit` from 5.0.0 to 5.1.0
- [Release notes](https://github.com/syntax-tree/unist-util-visit/releases)
- [Commits](syntax-tree/unist-util-visit@5.0.0...5.1.0)

---
updated-dependencies:
- dependency-name: unist-util-visit
  dependency-version: 5.1.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: doc
...

Signed-off-by: dependabot[bot] <support@github.com>
PR-URL: #61646
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: dependabot[bot]