chore(deps-dev): bump typescript (#54)

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 4.2.0-dev.20210111 to 4.2.0-dev.20210123.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](https://github.com/Microsoft/TypeScript/commits)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -50,7 +50,7 @@
     "prettier": "^2.2.1",
     "print-diff": "^1.0.0",
     "styleless-innertext": "^1.1.2",
-    "typescript": "^4.2.0-dev.20210108",
+    "typescript": "^4.2.0-dev.20210123",
     "webidl2": "^23.13.0",
     "webref": "github:w3c/webref#0a7f248e2c58286319f6b77d522670574916318e"
   },