Update changelog based on model updates

.changes/next-release/api-change-cloudfront-10828.json

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+{
+  "type": "api-change",
+  "category": "``cloudfront``",
+  "description": "No API changes from previous release. This release migrated the model to Smithy keeping all features unchanged."
+}

.changes/next-release/api-change-inspector2-77392.json

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+{
+  "type": "api-change",
+  "category": "``inspector2``",
+  "description": "Adds support for filePath filter."
+}

.changes/next-release/api-change-lambda-21289.json

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+{
+  "type": "api-change",
+  "category": "``lambda``",
+  "description": "Add Python 3.13 (python3.13) support to AWS Lambda"
+}

.changes/next-release/api-change-opensearch-74234.json

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+{
+  "type": "api-change",
+  "category": "``opensearch``",
+  "description": "Adds Support for new AssociatePackages and DissociatePackages API in Amazon OpenSearch Service that allows association and dissociation operations to be carried out on multiple packages at the same time."
+}

.changes/next-release/api-change-outposts-49603.json

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+{
+  "type": "api-change",
+  "category": "``outposts``",
+  "description": "This release updates StartCapacityTask to allow an active Outpost to be modified. It also adds a new API to list all running EC2 instances on the Outpost."
+}