Bump hexo-theme-next from 8.19.2 to 8.20.0

Bumps [hexo-theme-next](https://github.com/next-theme/hexo-theme-next) from 8.19.2 to 8.20.0.
- [Release notes](https://github.com/next-theme/hexo-theme-next/releases)
- [Commits](https://github.com/next-theme/hexo-theme-next/compare/v8.19.2...v8.20.0)

---
updated-dependencies:
- dependency-name: hexo-theme-next
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -32,7 +32,7 @@
     "hexo-server": "^3.0.0",
     "hexo-tag-cloud": "2.1.*",
     "hexo-theme-landscape": "^1.0.0",
-    "hexo-theme-next": "^8.19.2",
+    "hexo-theme-next": "^8.20.0",
     "hexo-word-counter": "^0.2.0"
   }
 }