Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-bedrockruntime-6374.json

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+{
+ "type": "api-change",
+ "category": "``bedrock-runtime``",
+ "description": "Bedrock Runtime Reserved Service Support"
+}

.changes/next-release/api-change-computeoptimizer-96312.json

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+{
+ "type": "api-change",
+ "category": "``compute-optimizer``",
+ "description": "Compute Optimizer now identifies idle NAT Gateway resources for cost optimization based on traffic patterns and backup configuration analysis. Access recommendations via the GetIdleRecommendations API."
+}

.changes/next-release/api-change-costoptimizationhub-95197.json

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+{
+ "type": "api-change",
+ "category": "``cost-optimization-hub``",
+ "description": "This release enables AWS Cost Optimization Hub to show cost optimization recommendations for NAT Gateway."
+}