Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-bedrock-16044.json

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+{
+  "type": "api-change",
+  "category": "``bedrock``",
+  "description": "Release includes an increase to the maximum policy build document size, an update to DeleteAutomatedReasoningPolicyBuildWorkflow to add ResourceInUseException, and corrections to UpdateAutomatedReasoningPolicyTestCaseRequest."
+}

.changes/next-release/api-change-budgets-24702.json

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+{
+  "type": "api-change",
+  "category": "``budgets``",
+  "description": "Added BillingViewHealthStatus Exception which is thrown when a Budget is created or updated with a Billing View that is not in the HEALTHY status"
+}

.changes/next-release/api-change-chimesdkmessaging-46931.json

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+{
+  "type": "api-change",
+  "category": "``chime-sdk-messaging``",
+  "description": "Amazon Chime SDK Messaging GetMessagingSessionEndpoint API now returns dual-stack WebSocket endpoints supporting IPv4/IPv6."
+}

.changes/next-release/api-change-ec2-28596.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "Allowed AMIs adds support for four new parameters - marketplaceProductCodes, deprecationTimeCondition, creationDateCondition and imageNames"
+}