build: bump vuepress from 1.9.5 to 1.9.7 in /docs (#3494)

Bumps [vuepress](https://github.com/vuejs/vuepress/tree/HEAD/packages/vuepress) from 1.9.5 to 1.9.7.
- [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/v1.9.7/packages/vuepress)

---
updated-dependencies:
- dependency-name: vuepress
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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docs/package.json

@@ -5,7 +5,7 @@
   },
   "devDependencies": {
     "@vuepress/plugin-google-analytics": "^1.9.7",
-    "vuepress": "^1.9.5",
+    "vuepress": "^1.9.7",
     "vuepress-plugin-code-copy": "^1.0.6",
     "vuepress-plugin-sitemap": "^2.3.1",
     "vuepress-theme-default-prefers-color-scheme": "^2.0.0"