chore(deps): update dependency vitest to v2

Author: renovate[bot]

package.json

@@ -59,7 +59,7 @@
     "prettier": "3.3.3",
     "rimraf": "5.0.10",
     "typescript": "5.6.2",
-    "vitest": "1.6.0"
+    "vitest": "2.1.2"
   },
   "keywords": [
     "micromark",