Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-connect-31799.json

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+{
+  "type": "api-change",
+  "category": "``connect``",
+  "description": "This release adds a new API GetContactMetrics for Amazon Connect."
+}

.changes/next-release/api-change-inspector2-95416.json

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+{
+  "type": "api-change",
+  "category": "``inspector2``",
+  "description": "Add CVSSV4 to Vulnerability Search API and update enable/disable account id list length to 5"
+}

.changes/next-release/api-change-iotdata-32622.json

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+{
+  "type": "api-change",
+  "category": "``iot-data``",
+  "description": "Adding DeleteConnection API to IoT Data Plane"
+}

.changes/next-release/api-change-sagemaker-76542.json

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+{
+  "type": "api-change",
+  "category": "``sagemaker``",
+  "description": "Adds support for GB200 UltraServers in Amazon SageMaker training jobs, training plans, and HyperPod clusters"
+}

.changes/next-release/api-change-transcribe-76996.json

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+{
+  "type": "api-change",
+  "category": "``transcribe``",
+  "description": "Update documentation to use key ARN only in OutputEncryptionKMSKeyId request parameter"
+}