Bump chai from 4.3.8 to 4.3.9 (#767)

Bumps [chai](https://github.com/chaijs/chai) from 4.3.8 to 4.3.9.
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/4.x.x/History.md)
- [Commits](chaijs/chai@v4.3.8...v4.3.9)

---
updated-dependencies:
- dependency-name: chai
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -35,7 +35,7 @@
     "@types/supertest": "^2.0.13",
     "@types/ws": "^8.5.6",
     "@types/xml2js": "^0.4.12",
-    "chai": "^4.3.8",
+    "chai": "^4.3.9",
     "chai-as-promised": "^7.1.1",
     "chrome-launcher": "^1.0.0",
     "chrome-remote-interface": "^0.33.0",