Bump typescript from 3.9.3 to 3.9.6 (#2798)

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.9.3 to 3.9.6.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v3.9.3...v3.9.6)

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

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

Author: dependabot-preview[bot]

package-lock.json

@@ -70,7 +70,7 @@
     "rewire": "~5.0.0",
     "sinon": "~9.0.2",
     "tslint": "~6.1.2",
-    "typescript": "~3.9.3",
+    "typescript": "~3.9.6",
     "vsce": "~1.77.0",
     "vscode-test": "~1.4.0"
   },