Bump gatsby-plugin-netlify from 2.11.0 to 3.0.0

Bumps [gatsby-plugin-netlify](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-netlify) from 2.11.0 to 3.0.0.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-plugin-netlify/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-plugin-netlify@3.0.0/packages/gatsby-plugin-netlify)

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

package.json

@@ -42,7 +42,7 @@
     "gatsby-plugin-dark-mode": "^1.1.0",
     "gatsby-plugin-google-analytics": "^2.1.29",
     "gatsby-plugin-manifest": "^3.0.0",
-    "gatsby-plugin-netlify": "^2.1.27",
+    "gatsby-plugin-netlify": "^3.0.0",
     "gatsby-plugin-offline": "^3.0.27",
     "gatsby-plugin-react-helmet": "^4.0.0",
     "gatsby-plugin-robots-txt": "^1.5.0",