Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-cloudfront-39004.json

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+{
+  "type": "api-change",
+  "category": "``cloudfront``",
+  "description": "Add dualstack endpoint support"
+}

.changes/next-release/api-change-deadline-7202.json

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+{
+  "type": "api-change",
+  "category": "``deadline``",
+  "description": "Add support for VPC resource endpoints in Service Managed Fleets"
+}

.changes/next-release/api-change-ec2-68369.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "This release adds support for C8gn, F2 and P6e-GB200 Instance types"
+}

.changes/next-release/api-change-sagemaker-63240.json

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+{
+  "type": "api-change",
+  "category": "``sagemaker``",
+  "description": "This release adds 1/ Support for S3FileSystem in CustomFileSystems 2/ The ability for a customer to select their preferred IpAddressType for use with private Workforces 3/ Support for p4de instance type in SageMaker Training Plans"
+}

.changes/next-release/api-change-timestreaminfluxdb-9547.json

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+{
+  "type": "api-change",
+  "category": "``timestream-influxdb``",
+  "description": "Timestream for InfluxDB adds support for db.influx.24xlarge instance type. This enhancement enables higher compute capacity for demanding workloads through CreateDbInstance, CreateDbCluster, UpdateDbInstance, and UpdateDbCluster APIs."
+}