Add changelog entries from botocore

.changes/next-release/api-change-dynamodb-8380.json

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+{
+  "type": "api-change",
+  "category": "``dynamodb``",
+  "description": "[``botocore``] Generate account endpoint for DynamoDB requests when the account ID is available"
+}

.changes/next-release/api-change-neptune-81367.json

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+{
+  "type": "api-change",
+  "category": "``neptune``",
+  "description": "[``botocore``] Add v2 smoke tests and smithy smokeTests trait for SDK testing."
+}

.changes/next-release/api-change-sagemaker-96371.json

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+{
+  "type": "api-change",
+  "category": "``sagemaker``",
+  "description": "[``botocore``] Amazon SageMaker now supports using manifest files to specify the location of uncompressed model artifacts within Model Packages"
+}

.changes/next-release/api-change-sagemakermetrics-56545.json

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+{
+  "type": "api-change",
+  "category": "``sagemaker-metrics``",
+  "description": "[``botocore``] This release introduces support for the SageMaker Metrics BatchGetMetrics API."
+}

.changes/next-release/api-change-workspaces-98731.json

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+{
+  "type": "api-change",
+  "category": "``workspaces``",
+  "description": "[``botocore``] Releasing new ErrorCodes for SysPrep failures during ImageImport and CreateImage process"
+}