Add typescript dependency to pr-checks/package.json

Author: mbg

package-lock.json

@@ -11,6 +11,7 @@
   },
   "devDependencies": {
     "@types/node": "^20.19.9",
-    "tsx": "^4.21.0"
+    "tsx": "^4.21.0",
+    "typescript": "^6.0.2"
   }
 }