Bump chai from 3.5.0 to 4.3.4 (RobotWebTools#372)

Bumps [chai](https://github.com/chaijs/chai) from 3.5.0 to 4.3.4.
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/main/History.md)
- [Commits](chaijs/chai@3.5.0...v4.3.4)

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

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

package.json

@@ -12,7 +12,7 @@
     "three": "^0.89.0"
   },
   "devDependencies": {
-    "chai": "^3.5.0",
+    "chai": "^4.3.4",
     "debug": "^4.3.1",
     "grunt": "^1.0.2",
     "grunt-contrib-clean": "^1.0.0",