chore: bump up pnpm to v10.18.0 (#2128)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -2,7 +2,7 @@
   "name": "@milkdown/monorepo",
   "version": "0.0.0",
   "private": true,
-  "packageManager": "pnpm@10.17.1",
+  "packageManager": "pnpm@10.18.0",
   "engines": {
     "node": ">=22"
   },