chore(deps): bump aws-cdk-lib in /examples/servers/zen

Bumps [aws-cdk-lib](https://github.com/aws/aws-cdk) from 2.220.0 to 2.221.1.
- [Release notes](https://github.com/aws/aws-cdk/releases)
- [Changelog](https://github.com/aws/aws-cdk/blob/main/CHANGELOG.v2.alpha.md)
- [Commits](aws/aws-cdk@v2.220.0...v2.221.1)

---
updated-dependencies:
- dependency-name: aws-cdk-lib
  dependency-version: 2.221.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

examples/servers/zen/requirements.txt

@@ -1,3 +1,3 @@
-aws-cdk-lib==2.220.0
+aws-cdk-lib==2.221.1
 constructs>=10.0.0,<11.0.0
 cdk-nag==2.37.55