Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-autoscaling-34617.json

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+{
+  "type": "api-change",
+  "category": "``autoscaling``",
+  "description": "Added WaitForTransitioningInstances parameter to the CancelInstanceRefresh API, allowing the caller to cancel an instance refresh without waiting for on-going launches and terminations."
+}

.changes/next-release/api-change-cloudwatch-19808.json

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+{
+  "type": "api-change",
+  "category": "``cloudwatch``",
+  "description": "Added a new API - DescribeAlarmContributors API, to retrieve alarm contributors in ALARM state. Added support in DescribeAlarmHistory API to query alarm contributor history"
+}

.changes/next-release/api-change-connect-80282.json

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+{
+  "type": "api-change",
+  "category": "``connect``",
+  "description": "SDK release for user defined predefined attributes."
+}

.changes/next-release/api-change-datazone-87417.json

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+{
+  "type": "api-change",
+  "category": "``datazone``",
+  "description": "Adds support for custom blueprints"
+}

.changes/next-release/api-change-mediapackagev2-91362.json

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+{
+  "type": "api-change",
+  "category": "``mediapackagev2``",
+  "description": "Added CUE tag SCTE output to MediaPackageV2 HLS and LL-HLS manifests."
+}

.changes/next-release/api-change-organizations-79462.json

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+{
+  "type": "api-change",
+  "category": "``organizations``",
+  "description": "Documentation updates for AWS Organizations APIs."
+}

.changes/next-release/api-change-sagemaker-5079.json

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+{
+  "type": "api-change",
+  "category": "``sagemaker``",
+  "description": "Released IPv6 support with dual-stack domain options on SageMaker Studio and introduced support for p6-b200.48xlarge instance type on SageMaker Studio for JupyterLab and CodeEditor applications."
+}