Update changelog based on model updates

.changes/next-release/api-change-appflow-80238.json

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+{
+  "type": "api-change",
+  "category": "``appflow``",
+  "description": "Adding the following features/changes: Parquet output that preserves typing from the source connector, Failed executions threshold before deactivation for scheduled flows, increasing max size of access and refresh token from 2048 to 4096"
+}

.changes/next-release/api-change-datasync-33652.json

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+{
+  "type": "api-change",
+  "category": "``datasync``",
+  "description": "AWS DataSync now supports TLS encryption in transit, file system policies and access points for EFS locations."
+}

.changes/next-release/api-change-emrserverless-11966.json

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+{
+  "type": "api-change",
+  "category": "``emr-serverless``",
+  "description": "This release adds support for Amazon EMR Serverless, a serverless runtime environment that simplifies running analytics applications using the latest open source frameworks such as Apache Spark and Apache Hive."
+}

.changes/next-release/api-change-sagemaker-35788.json

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+{
+  "type": "api-change",
+  "category": "``sagemaker``",
+  "description": "Amazon SageMaker Notebook Instances now allows configuration of Instance Metadata Service version and Amazon SageMaker Studio now supports G5 instance types."
+}