Issue:
[BUG] Update Iatapay config URL to use sandbox URl instead of production URL

### Bug Description

It bugs out when you try to do a payment with Iatapay and it throws Unauthorized error in Sandbox environment

### Expected Behavior

It should do the payment.

### Actual Behavior

Throws an error

### Steps To Reproduce

1. Do a Payment through Iatapay

### Context For The Bug

Error. Unauthorized error.

### Environment

Are you using hyperswitch hosted version? Yes

Sandbox

### Have you spent some time checking if this bug has been raised before?

- [X] I checked and didn't find a similar issue

### Have you read the Contributing Guidelines?

- [X] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### Are you willing to submit a PR?

Yes, I am willing to submit a PR!

Resolution:
<think>
PR Context:
- Title: chore(env): update Iatapay env to use Sandbox URL instead of Prod
- Merged: 2024-02-13T13:19:45Z
- Files changed: 1 files
- Commits: 1 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [x] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
This PR updates Iatapay to use Sandbox URL instead of Production URL in Sandbox environment.

Closes #3643

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifi
</think>

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