Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-appsync-91298.json

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+{
+  "type": "api-change",
+  "category": "``appsync``",
+  "description": "[``botocore``] Documented the new OpenSearchServiceDataSourceConfig data type. Added deprecation notes to the ElasticsearchDataSourceConfig data type."
+}

.changes/next-release/api-change-mediaconvert-6665.json

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+{
+  "type": "api-change",
+  "category": "``mediaconvert``",
+  "description": "[``botocore``] This release adds style and positioning support for caption or subtitle burn-in from rich text sources such as TTML. This release also introduces configurable image-based trick play track generation."
+}

.changes/next-release/api-change-ssm-28490.json

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+{
+  "type": "api-change",
+  "category": "``ssm``",
+  "description": "[``botocore``] Added cutoff behavior support for preventing new task invocations from starting when the maintenance window cutoff time is reached."
+}