build(deps): bump gatsby-plugin-manifest from 4.7.0 to 4.9.0 in /docs (golangci#2635)

Author: dependabot[bot]

docs/package-lock.json

@@ -16,7 +16,7 @@
     "gatsby-plugin-catch-links": "^4.6.0",
     "gatsby-plugin-emotion": "^7.9.0",
     "gatsby-plugin-google-analytics": "^4.6.0",
-    "gatsby-plugin-manifest": "^4.7.0",
+    "gatsby-plugin-manifest": "^4.9.0",
     "gatsby-plugin-mdx": "^3.9.0",
     "gatsby-plugin-netlify": "^4.1.0",
     "gatsby-plugin-netlify-cache": "^2.0.0",