Issue:
Bug: [CHORE] Add file storage config in env_specific toml 



### Feature Description

Add file storage config in env_specific.toml

### Possible Implementation

Add file storage config in env_specific.toml

### Have you spent some time checking if this feature request 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!

Pull request description:
## 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 adds file storage config in `env_specific.toml`

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
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Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

If you don't have an issue, we'd recommend starting with one first so the PR
can focus on the implementation (unless it is an obvious bug or documentation fix
that will have little conversation).
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## How did you test it?
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Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
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Cannot be tested as this is just a config addition

## Checklist
<!-- Put an `x` in the boxes that apply -->

- [ ] I formatted the code `cargo +nightly fmt --all`
- [ ] I addressed lints thrown by `cargo clippy`
- [ ] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable


Testing:

Cannot be tested as this is just a config addition

Patch:
diff --git a/config/deployments/env_specific.toml b/config/deployments/env_specific.toml
index 354c320e8f5..04831376050 100644
--- a/config/deployments/env_specific.toml
+++ b/config/deployments/env_specific.toml
@@ -70,9 +70,13 @@ api_logs_topic = "topic"              # Kafka topic to be used for incoming api
 connector_logs_topic = "topic"        # Kafka topic to be used for connector api events
 outgoing_webhook_logs_topic = "topic" # Kafka topic to be used for outgoing webhook events
 
-[file_upload_config]
-bucket_name = "bucket"
-region = "bucket_region"
+# File storage configuration
+[file_storage]
+file_storage_backend = "aws_s3" # File storage backend to be used
+
+[file_storage.aws_s3]
+region = "bucket_region" # The AWS region used by AWS S3 for file storage
+bucket_name = "bucket"   # The AWS S3 bucket name for file storage
 
 # This section provides configs for currency conversion api
 [forex_api]