Bump @aws-cdk/assert from 1.91.0 to 1.92.0 in /source

Bumps [@aws-cdk/assert](https://github.com/aws/aws-cdk/tree/HEAD/packages/@aws-cdk/assert) from 1.91.0 to 1.92.0.
- [Release notes](https://github.com/aws/aws-cdk/releases)
- [Changelog](https://github.com/aws/aws-cdk/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-cdk/commits/v1.92.0/packages/@aws-cdk/assert)

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