[typings]: Bump typescript from 2.9.2 to 4.7.3 in /typings

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 2.9.2 to 4.7.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v2.9.2...v4.7.3)

---
updated-dependencies:
- dependency-name: typescript
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

typings/package.json

@@ -14,10 +14,10 @@
 	},
 
 	"dependencies": {
-		"typescript": "^2.3.4"
+		"typescript": "^4.7.3"
 	},
 	"devDependencies": {
-		"typescript": "^2.3.4"
+		"typescript": "^4.7.3"
 	},
 	"keywords": [],
 	"repository": {