Bump sitemap from 6.3.3 to 7.0.0

Bumps [sitemap](https://github.com/ekalinin/sitemap.js) from 6.3.3 to 7.0.0.
- [Release notes](https://github.com/ekalinin/sitemap.js/releases)
- [Changelog](https://github.com/ekalinin/sitemap.js/blob/master/CHANGELOG.md)
- [Commits](ekalinin/sitemap.js@6.3.3...7.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -44,7 +44,7 @@
     "remove-markdown": "^0.3.0",
     "sass": "^1.32.13",
     "signale": "^1.4.0",
-    "sitemap": "^6.3.3",
+    "sitemap": "^7.0.0",
     "truncate": "^2.1.0",
     "yaml": "^1.10.0"
   },