fix(deps): bump gatsby-plugin-sass from 6.13.1 to 6.14.0

Bumps [gatsby-plugin-sass](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-sass) from 6.13.1 to 6.14.0.
- [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@6.14.0/packages/gatsby-plugin-sass)

---
updated-dependencies:
- dependency-name: gatsby-plugin-sass
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -20,7 +20,7 @@
     "gatsby-plugin-offline": "^6.13.3",
     "gatsby-plugin-postcss": "^6.14.0",
     "gatsby-plugin-react-helmet": "^6.13.1",
-    "gatsby-plugin-sass": "^6.13.1",
+    "gatsby-plugin-sass": "^6.14.0",
     "gatsby-plugin-sharp": "^5.13.1",
     "gatsby-plugin-use-dark-mode": "^2.0.1",
     "gatsby-remark-copy-linked-files": "^6.14.0",