chore(deps): bump @smithy/util-utf8 from 2.0.0 to 2.3.0

Bumps [@smithy/util-utf8](https://github.com/awslabs/smithy-typescript/tree/HEAD/packages/util-utf8) from 2.0.0 to 2.3.0.
- [Release notes](https://github.com/awslabs/smithy-typescript/releases)
- [Changelog](https://github.com/smithy-lang/smithy-typescript/blob/main/packages/util-utf8/CHANGELOG.md)
- [Commits](https://github.com/awslabs/smithy-typescript/commits/@smithy/[email protected]/packages/util-utf8)

---
updated-dependencies:
- dependency-name: "@smithy/util-utf8"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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