Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-amp-44517.json

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+{
+  "type": "api-change",
+  "category": "``amp``",
+  "description": "Add Resource-based Policy APIs for Amazon Prometheus"
+}

.changes/next-release/api-change-bedrockagent-83889.json

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+{
+  "type": "api-change",
+  "category": "``bedrock-agent``",
+  "description": "This release adds support for saving Bedrock Flows while node configuration is still in progress, even if the Flow is not yet able to be invoked"
+}

.changes/next-release/api-change-glue-10513.json

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+{
+  "type": "api-change",
+  "category": "``glue``",
+  "description": "AWS Glue Zero ETL now supports On-demand snapshot load"
+}