Bump gatsby-plugin-sass from 2.1.29 to 2.1.30

Bumps [gatsby-plugin-sass](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-sass) from 2.1.29 to 2.1.30.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-plugin-sass/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-plugin-sass@2.1.30/packages/gatsby-plugin-sass)

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

package.json

@@ -11,7 +11,7 @@
     "gatsby-plugin-react-helmet": "^3.1.22",
     "gatsby-plugin-remove-serviceworker": "^1.0.0",
     "gatsby-plugin-robots-txt": "^1.5.0",
-    "gatsby-plugin-sass": "^2.1.29",
+    "gatsby-plugin-sass": "^2.1.30",
     "gatsby-plugin-sharp": "^2.4.5",
     "gatsby-source-filesystem": "^2.1.48",
     "gatsby-transformer-sharp": "^2.3.16",

yarn.lock

@@ -5551,10 +5551,10 @@ gatsby-plugin-robots-txt@^1.5.0:
     "@babel/runtime" "^7.5.1"
     generate-robotstxt "^7.1.0"
 
-gatsby-plugin-sass@^2.1.29:
-  version "2.1.29"
-  resolved "https://registry.yarnpkg.com/gatsby-plugin-sass/-/gatsby-plugin-sass-2.1.29.tgz#07e44f346d6e40bea9816bd710e994bc34bb29be"
-  integrity sha512-/t0NioasjZnCm+vICI7LQH3Ge/oc1NVMfTR4v+8LwjQGIUR+Tgd7k0soiVeyVXCNl7zV/oYTVkzPcjxkIYrDxQ==
+gatsby-plugin-sass@^2.1.30:
+  version "2.1.30"
+  resolved "https://registry.yarnpkg.com/gatsby-plugin-sass/-/gatsby-plugin-sass-2.1.30.tgz#ed322c90746e2d43bb8ccf000abeee5d4473d4bc"
+  integrity sha512-ruK35EVEhZNZGx16s5fu3v1NsJQl31F6jVwbJbA3fSW8iPOY+vOuY3pytsKe++7sRrqd+dolCo5NFnKsGNoNDg==
   dependencies:
     "@babel/runtime" "^7.7.6"
     sass-loader "^7.3.1"