Bump @types/chai from 4.2.0 to 4.2.3 in /js

Bumps [@types/chai](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/chai) from 4.2.0 to 4.2.3.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/chai)

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

js/package.json

@@ -39,7 +39,7 @@
     "vuex": "^3.1.0"
   },
   "devDependencies": {
-    "@types/chai": "^4.1.7",
+    "@types/chai": "^4.2.3",
     "@types/leaflet": "^1.4.4",
     "@types/lodash": "^4.14.123",
     "@types/mocha": "^5.2.6",