Build(deps-dev): bump gatsby-plugin-styled-components (#3602)

Bumps [gatsby-plugin-styled-components](https://github.com/gatsbyjs/gatsby/tree/master/packages/gatsby-plugin-styled-components) from 3.0.7 to 3.1.0.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-plugin-styled-components/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-plugin-styled-components@3.1.0/packages/gatsby-plugin-styled-components)

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

package-lock.json

@@ -11516,9 +11516,9 @@
       }
     },
     "gatsby-plugin-styled-components": {
-      "version": "3.0.7",
-      "resolved": "https://registry.npmjs.org/gatsby-plugin-styled-components/-/gatsby-plugin-styled-components-3.0.7.tgz",
-      "integrity": "sha512-a9sg4qWC5K75eip7TwN4F2TGXCaoRZhx9lvu1U5aQQrC8OpTgWus66Fzws0XVcUCe18isfOm1kGfhLNm5/lOFw==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/gatsby-plugin-styled-components/-/gatsby-plugin-styled-components-3.1.0.tgz",
+      "integrity": "sha512-VMaq82vU7WsfXj5kOxGJP7w9MOUUxT3mcs4NYZqHGvFU+2+oeO70SJ1WoeB5TSIFEKlNhGUiKTdL6NcMh54/nA==",
       "dev": true,
       "requires": {
         "@babel/runtime": "^7.0.0"

package.json

@@ -187,7 +187,7 @@
     "gatsby-plugin-page-creator": "^2.0.13",
     "gatsby-plugin-react-helmet": "^3.1.0",
     "gatsby-plugin-remove-trailing-slashes": "^2.0.11",
-    "gatsby-plugin-styled-components": "^3.0.7",
+    "gatsby-plugin-styled-components": "^3.1.0",
     "got": "^9.6.0",
     "humanize-string": "^2.1.0",
     "husky": "^2.4.1",