Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-cleanroomsml-92357.json

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+{
+  "type": "api-change",
+  "category": "``cleanroomsml``",
+  "description": "This release introduces Parquet result format support for ML Input Channel models in AWS Clean Rooms ML."
+}

.changes/next-release/api-change-cloudfront-57109.json

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+{
+  "type": "api-change",
+  "category": "``cloudfront``",
+  "description": "Doc only update for CloudFront that fixes some customer-reported issues"
+}

.changes/next-release/api-change-ec2-57456.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "AWS Free Tier Version2 Support"
+}

.changes/next-release/api-change-keyspacesstreams-32980.json

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+{
+  "type": "api-change",
+  "category": "``keyspacesstreams``",
+  "description": "Doc only update for the Amazon Keyspaces Streams API."
+}

.changes/next-release/api-change-mailmanager-73912.json

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+{
+  "type": "api-change",
+  "category": "``mailmanager``",
+  "description": "Allow underscores in the local part of the input of the \"Email recipients rewrite\" action in rule sets."
+}

.changes/next-release/api-change-mediaconvert-34906.json

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+{
+  "type": "api-change",
+  "category": "``mediaconvert``",
+  "description": "This release expands the range of supported audio outputs to include xHE, 192khz FLAC and the deprecation of dual mono for AC3."
+}

.changes/next-release/api-change-stepfunctions-86781.json

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+{
+  "type": "api-change",
+  "category": "``stepfunctions``",
+  "description": "Align input with style guidelines."
+}

.changes/next-release/api-change-synthetics-62657.json

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+{
+  "type": "api-change",
+  "category": "``synthetics``",
+  "description": "This feature allows AWS Synthetics customers to provide code dependencies using lambda layer while creating a canary"
+}