chore(deps): update dependency diffable-html to v6 (#13407)

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

packages/vant/package.json

@@ -65,7 +65,7 @@
     "@vue/runtime-core": "^3.5.13",
     "@vue/test-utils": "^2.4.6",
     "csstype": "^3.1.3",
-    "diffable-html": "^5.0.0",
+    "diffable-html": "^6.0.1",
     "jsdom": "^25.0.1",
     "typescript": "^5.8.2",
     "vite": "^5.4.14",