Bump types-aiobotocore from 2.14.0 to 2.15.1 in /backend/paaster

Bumps [types-aiobotocore](https://github.com/youtype/mypy_boto3_builder) from 2.14.0 to 2.15.1.
- [Release notes](https://github.com/youtype/mypy_boto3_builder/releases)
- [Commits](https://github.com/youtype/mypy_boto3_builder/commits)

---
updated-dependencies:
- dependency-name: types-aiobotocore
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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