build(deps-dev): bump typescript from 2.9.2 to 3.9.5

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 2.9.2 to 3.9.5.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v2.9.2...v3.9.5)

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

package.json

@@ -38,7 +38,7 @@
     "react": "^16.12.0",
     "react-test-renderer": "^16.12.0",
     "sinon": "^9.0.2",
-    "typescript": "^2.6.1"
+    "typescript": "^3.9.5"
   },
   "nyc": {
     "exclude": [