build(deps-dev): bump @smithy/abort-controller in /server

Bumps [@smithy/abort-controller](https://github.com/awslabs/smithy-typescript/tree/HEAD/packages/abort-controller) from 2.0.12 to 2.0.15.
- [Release notes](https://github.com/awslabs/smithy-typescript/releases)
- [Changelog](https://github.com/smithy-lang/smithy-typescript/blob/main/packages/abort-controller/CHANGELOG.md)
- [Commits](https://github.com/awslabs/smithy-typescript/commits/@smithy/[email protected]/packages/abort-controller)

---
updated-dependencies:
- dependency-name: "@smithy/abort-controller"
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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