Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-ec2-24646.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "Adds support to Capacity Blocks for ML for purchasing EC2 P6e-GB200 UltraServers. Customers can now purchase u-p6e-gb200x72 and u-p6e-gb200x36 UltraServers. Adds new DescribeCapacityBlocks andDescribeCapacityBlockStatus APIs. Adds support for CapacityBlockId to DescribeInstanceTopology."
+}

.changes/next-release/api-change-freetier-17543.json

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+{
+  "type": "api-change",
+  "category": "``freetier``",
+  "description": "This release introduces four new APIs: GetAccountPlanState and UpgradeAccountPlan for AWS account plan management; ListAccountActivities and GetAccountActivity that provide activity tracking capabilities."
+}

.changes/next-release/api-change-opsworkscm-90382.json

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+{
+  "type": "api-change",
+  "category": "``opsworkscm``",
+  "description": "Removing content that refers to an S3 bucket that is no longer in use."
+}