Bump typescript from 3.8.3 to 3.9.2 (#2711)

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)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -65,7 +65,7 @@
     "rewire": "~5.0.0",
     "sinon": "~9.0.2",
     "tslint": "~6.1.2",
-    "typescript": "~3.8.3",
+    "typescript": "~3.9.2",
     "vsce": "~1.75.0",
     "vscode-test": "~1.3.0"
   },