Bump sagemaker from 2.227.0 to 2.239.0 in /rastervision_aws_sagemaker

Bumps [sagemaker](https://github.com/aws/sagemaker-python-sdk) from 2.227.0 to 2.239.0.
- [Release notes](https://github.com/aws/sagemaker-python-sdk/releases)
- [Changelog](https://github.com/aws/sagemaker-python-sdk/blob/master/CHANGELOG.md)
- [Commits](aws/sagemaker-python-sdk@v2.227.0...v2.239.0)

---
updated-dependencies:
- dependency-name: sagemaker
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

rastervision_aws_sagemaker/requirements.txt

@@ -1,2 +1,2 @@
 rastervision_pipeline==0.31.2-dev
-sagemaker==2.227.0
+sagemaker==2.239.0