Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-batch-54926.json

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+{
+  "type": "api-change",
+  "category": "``batch``",
+  "description": "Starting in JAN 2026, AWS Batch will change the default AMI for new Amazon ECS compute environments from Amazon Linux 2 to Amazon Linux 2023. We recommend migrating AWS Batch Amazon ECS compute environments to Amazon Linux 2023 to maintain optimal performance and security."
+}

.changes/next-release/api-change-eks-91380.json

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+{
+  "type": "api-change",
+  "category": "``eks``",
+  "description": "Adds support for RepairConfig overrides and configurations in EKS Managed Node Groups."
+}

.changes/next-release/api-change-imagebuilder-89602.json

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+{
+  "type": "api-change",
+  "category": "``imagebuilder``",
+  "description": "Version ARNs are no longer required for the EC2 Image Builder list-image-build-version, list-component-build-version, and list-workflow-build-version APIs. Calling these APIs without the ARN returns all build versions for the given resource type in the requesting account."
+}