chore(deps-dev): Bump jsii-diff from 1.90.0 to 1.91.0

Bumps [jsii-diff](https://github.com/aws/jsii/tree/HEAD/packages/jsii-diff) from 1.90.0 to 1.91.0.
- [Release notes](https://github.com/aws/jsii/releases)
- [Changelog](https://github.com/aws/jsii/blob/main/CHANGELOG.md)
- [Commits](https://github.com/aws/jsii/commits/v1.91.0/packages/jsii-diff)

---
updated-dependencies:
- dependency-name: jsii-diff
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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