Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-bedrock-38242.json

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+{
+  "type": "api-change",
+  "category": "``bedrock``",
+  "description": "Release for fixing GetFoundationModel API behavior. Imported and custom models have their own exclusive API and GetFM should not accept those ARNS as input"
+}

.changes/next-release/api-change-bedrockruntime-15985.json

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+{
+  "type": "api-change",
+  "category": "``bedrock-runtime``",
+  "description": "New stop reason for Converse and ConverseStream"
+}

.changes/next-release/api-change-imagebuilder-49778.json

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+{
+  "type": "api-change",
+  "category": "``imagebuilder``",
+  "description": "This release introduces several new features and improvements to enhance pipeline management, logging, and resource configuration."
+}

.changes/next-release/api-change-vpclattice-6084.json

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+{
+  "type": "api-change",
+  "category": "``vpc-lattice``",
+  "description": "Adds support for specifying the number of IPv4 addresses in each ENI for the resource gateway for VPC Lattice."
+}