Use this method to unpin a message in a group, a supergroup, or a channel. The bot must be an administrator in the chat for this to work and must have the ‘can_pin_messages’ admin right in the supergroup or ‘can_edit_messages’ admin right in the channel. Returns True on success.
## Arguments
| Name | Type | Description |
| - | - | - |
| `chat_id` | `#!python3 Union[int, str]` | Unique identifier for the target chat or username of the target channel (in the format @channelusername) |