Bump @types/chai from 4.2.19 to 4.2.21

Bumps [@types/chai](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/chai) from 4.2.19 to 4.2.21.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/chai)

---
updated-dependencies:
- dependency-name: "@types/chai"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package-lock.json

@@ -540,9 +540,9 @@
       "dev": true
     },
     "@types/chai": {
-      "version": "4.2.19",
-      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.19.tgz",
-      "integrity": "sha512-jRJgpRBuY+7izT7/WNXP/LsMO9YonsstuL+xuvycDyESpoDoIAsMd7suwpB4h9oEWB+ZlPTqJJ8EHomzNhwTPQ==",
+      "version": "4.2.21",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.2.21.tgz",
+      "integrity": "sha512-yd+9qKmJxm496BOV9CMNaey8TWsikaZOwMRwPHQIjcOJM9oV+fi9ZMNw3JsVnbEEbo2gRTDnGEBv8pjyn67hNg==",
       "dev": true
     },
     "@types/color-name": {