build(deps-dev): bump @types/chai from 3.5.2 to 4.2.15

Bumps [@types/chai](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/chai) from 3.5.2 to 4.2.15.
- [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>

package.json

@@ -63,7 +63,7 @@
   },
   "homepage": "https://github.com/dolanmiu/docx#readme",
   "devDependencies": {
-    "@types/chai": "^3.4.35",
+    "@types/chai": "^4.2.15",
     "@types/mocha": "^8.0.0",
     "@types/request-promise": "^4.1.42",
     "@types/shortid": "0.0.29",