message: docs(Dialog): fix the min version of footer slot
diff: @@ -216,7 +216,7 @@ Vant exports following Dialog utility functions:
  | ---------------- | -------------- |
  | default | Custom message |
  | title | Custom title |
  -| footer `v3.0.10` | Custom footer |
  +| footer `v3.0.11` | Custom footer |
  ### Types
  