fix: Add openai dependency to sagemaker dependency group (strands-agents#678)

It depends on OpenAI and we a got a report about the need to install it explicitly

Co-authored-by: Mackenzie Zastrow <[email protected]>

Author: zastrowm

pyproject.toml

@@ -92,7 +92,9 @@ writer = [
 sagemaker = [
     "boto3>=1.26.0,<2.0.0",
     "botocore>=1.29.0,<2.0.0",
-    "boto3-stubs[sagemaker-runtime]>=1.26.0,<2.0.0"
+    "boto3-stubs[sagemaker-runtime]>=1.26.0,<2.0.0",
+    # uses OpenAI as part of the implementation
+    "openai>=1.68.0,<2.0.0",
 ]
 
 a2a = [