Bump Api version to 2025-12-01 for Microsoft.StorageSync

### Preconditions

- [x] No need to upgrade Python SDK or the Python SDK is ready.

### Related command

https://github.com/Azure/azure-rest-api-specs/blob/main/specification/storagesync/resource-manager/Microsoft.StorageSync/StorageSync/readme.md

### Resource Provider

Microsoft.StorageSync

### Description of Feature or Work Requested

Update Az Cli matching the new api version - protocol/contracts

### Minimum API Version Required

N/A

### Swagger PR link / SDK link

https://github.com/Azure/azure-rest-api-specs/blob/main/specification/storagesync/resource-manager/Microsoft.StorageSync/StorageSync/readme.md

### Request Example

Please look into https://github.com/Azure/azure-rest-api-specs/blob/main/specification/storagesync/resource-manager/Microsoft.StorageSync/StorageSync

### Target Date

09/07/2026

### PM Contact

Will Gries

### Engineer Contact

ankushb

### Additional context

_No response_