Bump hexo-generator-sitemap from 1.2.0 to 3.0.1

Bumps [hexo-generator-sitemap](https://github.com/hexojs/hexo-generator-sitemap) from 1.2.0 to 3.0.1.
- [Release notes](https://github.com/hexojs/hexo-generator-sitemap/releases)
- [Commits](hexojs/hexo-generator-sitemap@1.2.0...3.0.1)

---
updated-dependencies:
- dependency-name: hexo-generator-sitemap
  dependency-version: 3.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]