Bump gatsby-plugin-react-helmet from 3.6.0 to 3.7.0

Bumps [gatsby-plugin-react-helmet](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-react-helmet) from 3.6.0 to 3.7.0.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-plugin-react-helmet/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-plugin-react-helmet@3.7.0/packages/gatsby-plugin-react-helmet)

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

package.json

@@ -72,7 +72,7 @@
     "gatsby-plugin-favicon": "^3.1.6",
     "gatsby-plugin-polyfill-io": "^1.1.0",
     "gatsby-plugin-postcss": "^2.3.13",
-    "gatsby-plugin-react-helmet": "^3.6.0",
+    "gatsby-plugin-react-helmet": "^3.7.0",
     "gatsby-plugin-robots-txt": "^1.5.3",
     "gatsby-plugin-sharp": "^2.10.1",
     "gatsby-plugin-sitemap": "^2.8.0",