Bump sagemaker from 2.218.0 to 2.237.3 in /middleware_api

Bumps [sagemaker](https://github.com/aws/sagemaker-python-sdk) from 2.218.0 to 2.237.3.
- [Release notes](https://github.com/aws/sagemaker-python-sdk/releases)
- [Changelog](https://github.com/aws/sagemaker-python-sdk/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/sagemaker-python-sdk/compare/v2.218.0...v2.237.3)

---
updated-dependencies:
- dependency-name: sagemaker
  dependency-type: direct:production
...

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

middleware_api/requirements.txt

@@ -1,4 +1,4 @@
-sagemaker==2.218.0
+sagemaker==2.237.3
 requests~=2.32.0
 boto3~=1.34.1
 botocore~=1.34.1