Bump aws-cdk and @guardian/cdk in /cdk

Bumps [aws-cdk](https://github.com/aws/aws-cdk/tree/HEAD/packages/aws-cdk) and [@guardian/cdk](https://github.com/guardian/cdk). These dependencies needed to be updated together.

Updates `aws-cdk` from 2.148.0 to 2.162.1
- [Release notes](https://github.com/aws/aws-cdk/releases)
- [Changelog](https://github.com/aws/aws-cdk/blob/main/CHANGELOG.v2.md)
- [Commits](https://github.com/aws/aws-cdk/commits/v2.162.1/packages/aws-cdk)

Updates `@guardian/cdk` from 59.1.0 to 59.5.6
- [Release notes](https://github.com/guardian/cdk/releases)
- [Changelog](https://github.com/guardian/cdk/blob/main/CHANGELOG.md)
- [Commits](guardian/cdk@v59.1.0...v59.5.6)

---
updated-dependencies:
- dependency-name: aws-cdk
  dependency-type: direct:development
- dependency-name: "@guardian/cdk"
  dependency-type: direct:development
...

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Author: dependabot[bot]