build(deps): bump gatsby-plugin-google-analytics in /docs (#2539)

Bumps [gatsby-plugin-google-analytics](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-google-analytics) from 4.4.0 to 4.6.0.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-plugin-google-analytics/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-plugin-google-analytics@4.6.0/packages/gatsby-plugin-google-analytics)

---
updated-dependencies:
- dependency-name: gatsby-plugin-google-analytics
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/package-lock.json

@@ -15,7 +15,7 @@
     "gatsby-plugin-canonical-urls": "^2.10.0",
     "gatsby-plugin-catch-links": "^2.10.0",
     "gatsby-plugin-emotion": "^5.0.0",
-    "gatsby-plugin-google-analytics": "^4.4.0",
+    "gatsby-plugin-google-analytics": "^4.6.0",
     "gatsby-plugin-manifest": "^2.12.1",
     "gatsby-plugin-mdx": "^2.14.0",
     "gatsby-plugin-netlify": "^2.11.1",