[test] explicit ts dir

Author: avivkeller

packages/rehype-shiki/package.json

@@ -28,6 +28,7 @@
     "classnames": "catalog:",
     "hast-util-to-string": "^3.0.1",
     "shiki": "~3.8.1",
+    "typescript": "catalog:",
     "unist-util-visit": "^5.0.0"
   },
   "devDependencies": {