build(deps): bump polished from 4.1.4 to 4.2.2 in /docs

Bumps [polished](https://github.com/styled-components/polished) from 4.1.4 to 4.2.2.
- [Release notes](https://github.com/styled-components/polished/releases)
- [Commits](styled-components/polished@v4.1.4...v4.2.2)

---
updated-dependencies:
- dependency-name: polished
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

docs/package.json

@@ -25,18 +25,18 @@
     "gatsby-plugin-react-svg": "^3.1.0",
     "gatsby-plugin-robots-txt": "^1.7.0",
     "gatsby-plugin-sharp": "^4.13.0",
-    "gatsby-plugin-sitemap": "^5.11.1",
+    "gatsby-plugin-sitemap": "^5.13.0",
     "gatsby-remark-autolink-headers": "^5.13.0",
     "gatsby-remark-copy-linked-files": "^5.13.0",
     "gatsby-remark-external-links": "^0.0.4",
     "gatsby-remark-images": "^6.11.1",
     "gatsby-remark-mermaid": "^2.1.0",
-    "gatsby-remark-responsive-iframe": "^5.11.0",
+    "gatsby-remark-responsive-iframe": "^5.13.0",
     "gatsby-source-filesystem": "^4.13.0",
     "gatsby-transformer-remark": "^5.11.1",
     "gatsby-transformer-sharp": "^4.13.0",
     "gatsby-transformer-yaml": "^4.11.0",
-    "polished": "^4.1.4",
+    "polished": "^4.2.2",
     "postcss": "^8.4.12",
     "prism-react-renderer": "^1.3.1",
     "prop-types": "^15.8.1",