Fix: [AEA-0000] - Pin CDK version (#1711)

## Summary
- 🤖 Operational or Infrastructure Change
- ⚠️ Potential issues that might be caused by this change

### Details
- Pins CDK to v2.234.1 as v2.235.0 onwards appears to have a bug around
the use of tags with cloudfront key value stores, see:
aws/aws-cdk#36765

Author: Orkastrated