fix: Dropdown for custom attributes in conversation sidebar hides under the list (#11099)

# Pull Request Template

## Description

This PR fixes the issue where the custom attributes type list dropdown
in the conversation sidebar gets hidden under the section.

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)

## How Has This Been Tested?

### Screenshots
**Before**
<img width="310" alt="image"
src="https://github.com/user-attachments/assets/1aec7f08-8ca8-4868-914a-d545eab34dce"
/>


**After**
<img width="310" alt="image"
src="https://github.com/user-attachments/assets/eb9006f3-0bc1-4008-ac0d-1feeeadc139d"
/>



## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

app/javascript/dashboard/routes/dashboard/conversation/customAttributes/CustomAttributes.vue

@@ -271,7 +271,7 @@ const evenClass = [
       ghost-class="ghost"
       handle=".drag-handle"
       item-key="key"
-      class="last:rounded-b-lg overflow-hidden"
+      class="last:rounded-b-lg"
       :class="evenClass"
       @start="dragging = true"
       @end="onDragEnd"