fix: SSH key dropdown scrolls with modal (#38584)

## Description

This changes the dropdown container to fix overflow issues in the Git
connect/import modal. The SSH key dropdown now properly scrolls with the
modal content instead of remaining fixed in place.

## Type of Change
- Bug fix (non-breaking change which fixes an issue)

## How Has This Been Tested?
- Manual testing of dropdown scroll behavior in the Git connect modal

Link to Devin run:
https://app.devin.ai/sessions/be239c326a7149eaaefe6f6c39d58470

## Automation

/test sanity

### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results  -->
> [!TIP]
> 🟢 🟢 🟢 All cypress tests have passed! 🎉 🎉 🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/12710679010>
> Commit: 40cdbf4
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=12710679010&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Sanity`
> Spec:
> <hr>Fri, 10 Jan 2025 14:28:55 UTC
<!-- end of auto-generated comment: Cypress test results  -->

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: [email protected] <[email protected]>

app/client/src/git/components/ConnectModal/ConnectInitialize/AddDeployKey.tsx

@@ -291,7 +291,12 @@ function AddDeployKey({
           Now, give write access to it.
         </WellText>
         <FieldContainer>
-          <StyledSelect onChange={setKeyType} size="sm" value={keyType}>
+          <StyledSelect
+            getPopupContainer={(triggerNode) => triggerNode.parentNode}
+            onChange={setKeyType}
+            size="sm"
+            value={keyType}
+          >
             <Option value="ECDSA">ECDSA 256</Option>
             <Option value="RSA">RSA 4096</Option>
           </StyledSelect>