Bump gatsby-plugin-sass from 2.3.10 to 2.3.12

Bumps [gatsby-plugin-sass](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-sass) from 2.3.10 to 2.3.12.
- [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@2.3.12/packages/gatsby-plugin-sass)

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

package.json

@@ -14,7 +14,7 @@
     "gatsby-plugin-react-helmet": "^3.3.4",
     "gatsby-plugin-remove-serviceworker": "^1.0.0",
     "gatsby-plugin-robots-txt": "^1.5.1",
-    "gatsby-plugin-sass": "^2.3.10",
+    "gatsby-plugin-sass": "^2.3.12",
     "gatsby-plugin-sharp": "^2.6.18",
     "gatsby-source-filesystem": "^2.3.18",
     "gatsby-transformer-sharp": "^2.5.10",

yarn.lock

@@ -6456,10 +6456,10 @@ gatsby-plugin-robots-txt@^1.5.1:
     "@babel/runtime" "^7.10.0"
     generate-robotstxt "^8.0.3"
 
-gatsby-plugin-sass@^2.3.10:
-  version "2.3.10"
-  resolved "https://registry.yarnpkg.com/gatsby-plugin-sass/-/gatsby-plugin-sass-2.3.10.tgz#a6aec4a218318c613cf09de8defa42300283f6b9"
-  integrity sha512-ZF/+SNMogv6C+UksTLGCwQxeA5224fmp1ojJ/wOkmwMM83HClQ5wwcs0utQZmIOCAszEn+wi2wul1Tyiyh4YBg==
+gatsby-plugin-sass@^2.3.12:
+  version "2.3.12"
+  resolved "https://registry.yarnpkg.com/gatsby-plugin-sass/-/gatsby-plugin-sass-2.3.12.tgz#4ebdf2d541004e60a5d108eb1302a43b16ceeeaf"
+  integrity sha512-cQHp4bvK3a0xId4Q9K9/1ejGVMMOm/1I28ry7quVoHVomSB4SwNJpMTGSgSYAKn3gjsveUyL+ceCRWeiIavkPA==
   dependencies:
     "@babel/runtime" "^7.10.3"
     sass-loader "^7.3.1"