Bump puppeteer from 4.0.0 to 9.1.1

Bumps [puppeteer](https://pptr.dev/) from 4.0.0 to 9.1.1.
- [Release notes](https://github.com/puppeteer/puppeteer/releases/tag/v9.1.1)
- [Changelog](https://github.com/puppeteer/puppeteer/blob/main/CHANGELOG.md#911-2021-05-05)
- [Commits](puppeteer/puppeteer@v4.0.0...v9.1.1)

Bumps Chromium from 83.0.4103.0 to 91.0.4469.0.

Breaking changes don't affect this repo.

package.json

@@ -78,7 +78,7 @@
     "karma-webpack": "^4.0.2",
     "mocha": "^5.2.0",
     "npm-run-all": "^4.1.5",
-    "puppeteer": "^4.0.0",
+    "puppeteer": "^9.1.1",
     "replace-bundle-webpack-plugin": "^1.0.0",
     "sinon": "^6.3.5",
     "sinon-chai": "^3.2.0",