chore(deps): Bump markdown-it, @vuepress/plugin-docsearch, vuepress, vuepress-plugin-seo2 and vuepress-plugin-sitemap2

Bumps [markdown-it](https://github.com/markdown-it/markdown-it) to 14.1.1 and updates ancestor dependencies [markdown-it](https://github.com/markdown-it/markdown-it), [@vuepress/plugin-docsearch](https://github.com/vuepress/vuepress-next), [vuepress](https://github.com/vuejs/vuepress/tree/HEAD/packages/vuepress), [vuepress-plugin-seo2](https://github.com/vuepress-theme-hope/vuepress-theme-hope/tree/HEAD/packages/seo2) and [vuepress-plugin-sitemap2](https://github.com/vuepress-theme-hope/vuepress-theme-hope/tree/HEAD/packages/sitemap2). These dependencies need to be updated together.


Updates `markdown-it` from 13.0.1 to 14.1.1
- [Changelog](https://github.com/markdown-it/markdown-it/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it@13.0.1...14.1.1)

Updates `@vuepress/plugin-docsearch` from 2.0.0-beta.66 to 2.0.0-rc.125
- [Release notes](https://github.com/vuepress/vuepress-next/releases)
- [Changelog](https://github.com/vuepress/core/blob/main/CHANGELOG.md)
- [Commits](https://github.com/vuepress/vuepress-next/commits)

Updates `vuepress` from 2.0.0-beta.66 to 2.0.0-rc.26
- [Release notes](https://github.com/vuejs/vuepress/releases)
- [Changelog](https://github.com/vuejs/vuepress/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vuepress/commits/HEAD/packages/vuepress)

Updates `vuepress-plugin-seo2` from 2.0.0-beta.209 to 2.0.0-rc.16
- [Release notes](https://github.com/vuepress-theme-hope/vuepress-theme-hope/releases)
- [Changelog](https://github.com/vuepress-theme-hope/vuepress-theme-hope/blob/v2.0.0-rc.16/CHANGELOG.md)
- [Commits](https://github.com/vuepress-theme-hope/vuepress-theme-hope/commits/v2.0.0-rc.16/packages/seo2)

Updates `vuepress-plugin-sitemap2` from 2.0.0-beta.234 to 2.0.0-rc.16
- [Release notes](https://github.com/vuepress-theme-hope/vuepress-theme-hope/releases)
- [Changelog](https://github.com/vuepress-theme-hope/vuepress-theme-hope/blob/v2.0.0-rc.16/CHANGELOG.md)
- [Commits](https://github.com/vuepress-theme-hope/vuepress-theme-hope/commits/v2.0.0-rc.16/packages/sitemap2)

---
updated-dependencies:
- dependency-name: markdown-it
  dependency-version: 14.1.1
  dependency-type: indirect
- dependency-name: "@vuepress/plugin-docsearch"
  dependency-version: 2.0.0-rc.125
  dependency-type: direct:production
- dependency-name: vuepress
  dependency-version: 2.0.0-rc.26
  dependency-type: direct:production
- dependency-name: vuepress-plugin-seo2
  dependency-version: 2.0.0-rc.16
  dependency-type: direct:production
- dependency-name: vuepress-plugin-sitemap2
  dependency-version: 2.0.0-rc.16
  dependency-type: direct:production
...

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Author: dependabot[bot]