Bump typescript from 3.9.7 to 4.2.4

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.9.7 to 4.2.4.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v3.9.7...v4.2.4)

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

package.json

@@ -20,7 +20,7 @@
     "react-test-renderer": "^16.13.1",
     "reactstrap": "^8.5.1",
     "terser-webpack-plugin": "^4.1.0",
-    "typescript": "^3.9.7"
+    "typescript": "^4.2.4"
   },
   "scripts": {
     "build": "react-scripts build",