Bump typescript from 3.9.7 to 4.2.3

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.9.7 to 4.2.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](https://github.com/Microsoft/TypeScript/commits)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -47,6 +47,6 @@
     "jest": "^25.5.4",
     "prettier": "^2.2.1",
     "ts-jest": "^25.5.1",
-    "typescript": "^3.9.7"
+    "typescript": "^4.2.3"
   }
 }