The Nebular Dropdown (nbSelect) remains open and does not collapse when scrolling the page.

**Issue Description:**

The Nebular Dropdown (nbSelect) component exhibits a behavior where it remains open and does not collapse when the user scrolls the page. This issue can impact the user experience by causing the dropdown to obscure content or interfere with navigation, especially in scenarios where the dropdown is expected to close upon scrolling.

Please find the below screenshot of the issue for your reference.

**Problem Screenshot:**

**Example:**
https://akveo.github.io/nebular/example/select/select-showcase.component