chore(deps-dev): Bump cdk-nag from 2.28.67 to 2.28.68

Bumps [cdk-nag](https://github.com/cdklabs/cdk-nag) from 2.28.67 to 2.28.68.
- [Release notes](https://github.com/cdklabs/cdk-nag/releases)
- [Commits](cdklabs/cdk-nag@v2.28.67...v2.28.68)

---
updated-dependencies:
- dependency-name: cdk-nag
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>