build(deps): bump @emotion/styled from 11.3.0 to 11.6.0 in /docs

Bumps [@emotion/styled](https://github.com/emotion-js/emotion) from 11.3.0 to 11.6.0.
- [Release notes](https://github.com/emotion-js/emotion/releases)
- [Changelog](https://github.com/emotion-js/emotion/blob/main/CHANGELOG.md)
- [Commits](https://github.com/emotion-js/emotion/compare/@emotion/styled@11.3.0...@emotion/styled@11.6.0)

---
updated-dependencies:
- dependency-name: "@emotion/styled"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

docs/package.json

@@ -7,7 +7,7 @@
   "license": "MIT",
   "dependencies": {
     "@emotion/react": "^11.7.0",
-    "@emotion/styled": "^11.3.0",
+    "@emotion/styled": "^11.6.0",
     "@mdx-js/mdx": "^1.6.22",
     "@mdx-js/react": "^1.6.16",
     "gatsby": "^2.32.13",