Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-ecs-76338.json

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+{
+  "type": "api-change",
+  "category": "``ecs``",
+  "description": "[``botocore``] This is a documentation only release that adds additional information for Amazon ECS Availability Zone rebalancing."
+}

.changes/next-release/api-change-pcs-9075.json

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+{
+  "type": "api-change",
+  "category": "``pcs``",
+  "description": "[``botocore``] Documentation-only update to add AccountingStorageEnforce to SlurmCustomSetting."
+}

.changes/next-release/api-change-sagemaker-93373.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``sagemaker``",
+  "description": "[``botocore``] Release IPv6 support with dualstack in SageMaker Notebooks, Tiered Storage Checkpointing Support in SageMaker HyperPod and P5.4xlarge instance type for SageMaker Hosting."
+}