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

@@ -64,7 +64,7 @@
     "ts-loader": "6.2.2",
     "ts-node": "8.10.1",
     "tslint": "6.1.2",
-    "typescript": "3.8.3"
+    "typescript": "3.9.2"
   },
   "dependencies": {
     "boolean": "3.0.1",