Update changelog based on model updates

.changes/next-release/api-change-chatbot-47144.json

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+{
+  "type": "api-change",
+  "category": "``chatbot``",
+  "description": "Return State and StateReason fields for Chatbot Channel Configurations."
+}

.changes/next-release/api-change-lambda-91865.json

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+{
+  "type": "api-change",
+  "category": "``lambda``",
+  "description": "Reverting Lambda resource-based policy and block public access APIs."
+}

.changes/next-release/api-change-organizations-44474.json

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+{
+  "type": "api-change",
+  "category": "``organizations``",
+  "description": "Add support for policy operations on the CHATBOT_POLICY policy type."
+}

.changes/next-release/api-change-pcs-67277.json

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+{
+  "type": "api-change",
+  "category": "``pcs``",
+  "description": "AWS PCS API documentation - Edited the description of the iamInstanceProfileArn parameter of the CreateComputeNodeGroup and UpdateComputeNodeGroup actions; edited the description of the SlurmCustomSetting data type to list the supported parameters for clusters and compute node groups."
+}

.changes/next-release/api-change-rdsdata-27201.json

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+{
+  "type": "api-change",
+  "category": "``rds-data``",
+  "description": "Documentation update for RDS Data API to reflect support for Aurora MySQL Serverless v2 and Provisioned DB clusters."
+}

.changes/next-release/api-change-sagemaker-7851.json

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+{
+  "type": "api-change",
+  "category": "``sagemaker``",
+  "description": "Adding `TagPropagation` attribute to Sagemaker API"
+}