Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-bedrock-301.json

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+{
+  "type": "api-change",
+  "category": "``bedrock``",
+  "description": "This release includes model updates and enhanced SDK documentation for union fields in automated reasoning policy components. Added docs cover policy definitions, mutations (add/update for rules/types/variables), build assets, workflow sources, test results, and tag exception handling."
+}

.changes/next-release/api-change-cognitoidp-34555.json

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+{
+  "type": "api-change",
+  "category": "``cognito-idp``",
+  "description": "Remove SigV4 auth requirement for GetTokensFromRefreshToken"
+}

.changes/next-release/api-change-connect-78696.json

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+{
+  "type": "api-change",
+  "category": "``connect``",
+  "description": "Updating SearchUserHierarchyGroups API"
+}

.changes/next-release/api-change-deadline-68866.json

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+{
+  "type": "api-change",
+  "category": "``deadline``",
+  "description": "Adds support for Wait and Save feature in service-managed fleets"
+}

.changes/next-release/api-change-ec2-38469.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "This release adds AvailabilityZoneId support for CreateVolume, DescribeVolume, LaunchTemplates, RunInstances, DescribeInstances, CreateDefaultSubnet, SpotInstances, and CreateDefaultSubnet APIs."
+}

.changes/next-release/api-change-evs-12330.json

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+{
+  "type": "api-change",
+  "category": "``evs``",
+  "description": "Update for general availability of Amazon Elastic VMware Service (EVS)."
+}

.changes/next-release/api-change-lambda-46861.json

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+{
+  "type": "api-change",
+  "category": "``lambda``",
+  "description": "Doc-only update for Lambda that updates the maximum payload size for response streaming invocations to 200 MB."
+}

.changes/next-release/api-change-quicksight-11760.json

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+{
+  "type": "api-change",
+  "category": "``quicksight``",
+  "description": "Add RowAxisDisplayOptions and ColumnAxisDisplayOptions to HeatMapConfiguration, add Actions to PluginVisual, increase limit for CalculatedFields list"
+}

.changes/next-release/api-change-ssoadmin-69981.json

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+{
+  "type": "api-change",
+  "category": "``sso-admin``",
+  "description": "Added support for managing user background session for applications"
+}