build(deps-dev): Bump typescript from 3.8.3 to 3.9.2

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.8.3 to 3.9.2.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v3.8.3...v3.9.2)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -33,7 +33,7 @@
     "ts-node": "~8.10.1",
     "tslint": "~5.20.0",
     "typedoc": "~0.17.0",
-    "typescript": "~3.8.2"
+    "typescript": "~3.9.2"
   },
   "mocha": {
     "extension": [