Bump gatsby-plugin-react-helmet from 3.1.11 to 3.1.21

Bumps [gatsby-plugin-react-helmet](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-react-helmet) from 3.1.11 to 3.1.21.
- [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@3.1.21/packages/gatsby-plugin-react-helmet)

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

Author: dependabot-preview[bot]

package.json

@@ -11,7 +11,7 @@
     "gatsby-plugin-manifest": "^2.2.20",
     "gatsby-plugin-offline": "^3.0.13",
     "gatsby-plugin-postcss": "^2.1.10",
-    "gatsby-plugin-react-helmet": "^3.1.11",
+    "gatsby-plugin-react-helmet": "^3.1.21",
     "gatsby-plugin-sharp": "^2.2.27",
     "gatsby-source-filesystem": "^2.1.28",
     "gatsby-transformer-sharp": "^2.2.21",

yarn.lock

@@ -756,10 +756,10 @@
     "@babel/plugin-transform-react-jsx-self" "^7.0.0"
     "@babel/plugin-transform-react-jsx-source" "^7.0.0"
 
-"@babel/runtime@^7.0.0", "@babel/runtime@^7.1.2", "@babel/runtime@^7.3.4", "@babel/runtime@^7.4.2", "@babel/runtime@^7.4.5", "@babel/runtime@^7.6.2", "@babel/runtime@^7.6.3":
-  version "7.6.3"
-  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.6.3.tgz#935122c74c73d2240cafd32ddb5fc2a6cd35cf1f"
-  integrity sha512-kq6anf9JGjW8Nt5rYfEuGRaEAaH1mkv3Bbu6rYvLOpPh/RusSJXuKPEAoZ7L7gybZkchE8+NV5g9vKF4AGAtsA==
+"@babel/runtime@^7.0.0", "@babel/runtime@^7.1.2", "@babel/runtime@^7.3.4", "@babel/runtime@^7.4.2", "@babel/runtime@^7.4.5", "@babel/runtime@^7.6.2", "@babel/runtime@^7.6.3", "@babel/runtime@^7.7.6":
+  version "7.7.7"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.7.7.tgz#194769ca8d6d7790ec23605af9ee3e42a0aa79cf"
+  integrity sha512-uCnC2JEVAu8AKB5do1WRIsvrdJ0flYx/A/9f/6chdacnEZ7LmavjdsDXr5ksYBegxtuTPR5Va9/+13QF/kFkCA==
   dependencies:
     regenerator-runtime "^0.13.2"
 
@@ -5316,12 +5316,12 @@ gatsby-plugin-postcss@^2.1.10:
     "@babel/runtime" "^7.6.2"
     postcss-loader "^3.0.0"
 
-gatsby-plugin-react-helmet@^3.1.11:
-  version "3.1.11"
-  resolved "https://registry.yarnpkg.com/gatsby-plugin-react-helmet/-/gatsby-plugin-react-helmet-3.1.11.tgz#14150138c5eb641023ca3de98d822a4cc9b137d9"
-  integrity sha512-obVj6fzH0Hr6UdmQGaIYz29a1+h89pI+vKgIb2MwXCCDESCYgVYTcDmtBzYTZVLXupW6fqGlybFQwUKxEI0ZAQ==
+gatsby-plugin-react-helmet@^3.1.21:
+  version "3.1.21"
+  resolved "https://registry.yarnpkg.com/gatsby-plugin-react-helmet/-/gatsby-plugin-react-helmet-3.1.21.tgz#659f31020295f42d017e2eb03175d73516ab824d"
+  integrity sha512-6LZ2LEYTwqD+ZqyCH55mVpk2xEXbQoCTfijP1W4ZCQsKtpWGJP+vyd6b96FWVyEb2k5LsQ1u+jk4R8xXULSX+w==
   dependencies:
-    "@babel/runtime" "^7.6.3"
+    "@babel/runtime" "^7.7.6"
 
 gatsby-plugin-sharp@^2.2.27:
   version "2.2.27"