build(deps): bump gatsby-transformer-sharp in /docs

Bumps [gatsby-transformer-sharp](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-transformer-sharp) from 2.11.0 to 2.12.0.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-transformer-sharp/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/[email protected]/packages/gatsby-transformer-sharp)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs/package-lock.json

@@ -36,9 +36,9 @@
     "gatsby-remark-responsive-iframe": "^2.11.0",
     "gatsby-source-filesystem": "^2.8.1",
     "gatsby-transformer-remark": "^2.13.1",
-    "gatsby-transformer-sharp": "^2.11.0",
+    "gatsby-transformer-sharp": "^2.12.0",
     "gatsby-transformer-yaml": "^2.8.0",
-    "polished": "^4.0.5",
+    "polished": "^4.1.0",
     "prism-react-renderer": "^1.1.1",
     "prop-types": "^15.7.2",
     "puppeteer": "^7.0.1",