build(deps): bump puppeteer from 3.3.0 to 5.3.1 in /docs (#1418)

Bumps [puppeteer](https://github.com/puppeteer/puppeteer) from 3.3.0 to 5.3.1.
- [Release notes](https://github.com/puppeteer/puppeteer/releases)
- [Commits](puppeteer/puppeteer@v3.3.0...v5.3.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/package-lock.json

@@ -41,7 +41,7 @@
     "polished": "^3.6.6",
     "prism-react-renderer": "^1.1.1",
     "prop-types": "^15.7.2",
-    "puppeteer": "^3.3.0",
+    "puppeteer": "^5.3.1",
     "react": "^16.12.0",
     "react-dom": "^16.12.0",
     "react-headroom": "^3.0.0",