Bump prismjs from 1.29.0 to 1.30.0 in /docs

Bumps [prismjs](https://github.com/PrismJS/prism) from 1.29.0 to 1.30.0.
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/master/CHANGELOG.md)
- [Commits](PrismJS/prism@v1.29.0...v1.30.0)

---
updated-dependencies:
- dependency-name: prismjs
  dependency-type: direct:development
...

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

Author: dependabot[bot]

docs/package.json

@@ -20,7 +20,7 @@
     "@vuepress/plugin-register-components": "2.0.0-rc.0",
     "@vuepress/plugin-search": "2.0.0-rc.0",
     "@vuepress/utils": "2.0.0-rc.0",
-    "prismjs": "^1.29.0",
+    "prismjs": "^1.30.0",
     "vue": "^3.4.20",
     "vuepress": "2.0.0-rc.0"
   }