[Trigger] Miro polling trigger never fires

### Describe the issue

The Miro polling trigger fires once on deploy and never again. New boards created on Miro are not detected.

### Reproducibility and Visuals
Steps to reproduce:
1. Deploy the flow below.
2. Create a new board on Miro.
3. Wait. No execution is ever created.

```yaml
id: new_board_trigger
namespace: company.team

triggers:
- id: poll_new_boards
type: io.kestra.plugin.miro.boards.Trigger
token: "{{ secret('MIRO_TOKEN') }}"
teamId: "{{ secret('MIRO_TEAM_ID') }}"
interval: PT30S

tasks:
- id: log_new_board
type: io.kestra.plugin.core.log.Log
message: "New board: {{ trigger }}"
```

### Expected Behaviour
The trigger should fire every time a new board is created on Miro.

### Environment

- Kestra Version: 2.0 develop
- Setup: Standalone with Postgres