chore(deps): update dependency to-vfile to v8

Author: renovate[bot]

packages/blog-sync/package.json

@@ -18,7 +18,7 @@
     "remark-parse": "10.0.2",
     "remark-parse-frontmatter": "1.0.3",
     "remark-stringify": "10.0.3",
-    "to-vfile": "7.2.4",
+    "to-vfile": "8.0.0",
     "tsup": "8.3.5",
     "typescript": "5.7.3",
     "unified": "11.0.5",