Add changelog entries from botocore

.changes/next-release/api-change-cloudformation-88161.json

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+{
+  "type": "api-change",
+  "category": "``cloudformation``",
+  "description": "[``botocore``] We added 5 new stack refactoring APIs: CreateStackRefactor, ExecuteStackRefactor, ListStackRefactors, DescribeStackRefactor, ListStackRefactorActions."
+}

.changes/next-release/api-change-connectcases-29080.json

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+{
+  "type": "api-change",
+  "category": "``connectcases``",
+  "description": "[``botocore``] This release adds the ability to conditionally require fields on a template. Check public documentation for more information."
+}

.changes/next-release/api-change-costoptimizationhub-3541.json

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+{
+  "type": "api-change",
+  "category": "``cost-optimization-hub``",
+  "description": "[``botocore``] This release enables AWS Cost Optimization Hub to show cost optimization recommendations for Amazon Auto Scaling Groups, including those with single and mixed instance types."
+}

.changes/next-release/api-change-s3-85095.json

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+{
+  "type": "api-change",
+  "category": "``s3``",
+  "description": "[``botocore``] Updated list of the valid AWS Region values for the LocationConstraint parameter for general purpose buckets."
+}

.changes/next-release/enhancement-Eventsteam-78927.json

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+{
+  "type": "enhancement",
+  "category": "Eventsteam",
+  "description": "[``botocore``] The SDK no longer validates payload size for eventstreams. This is to facilitate varying payload requirements across AWS services."
+}