Add changelog entries from botocore

.changes/next-release/api-change-iotdata-21712.json

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+{
+  "type": "api-change",
+  "category": "``iot-data``",
+  "description": "[``botocore``] Updated Publish with support for new Retain flag and added two new API operations: GetRetainedMessage, ListRetainedMessages."
+}

.changes/next-release/api-change-mediaconvert-30507.json

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+{
+  "type": "api-change",
+  "category": "``mediaconvert``",
+  "description": "[``botocore``] AWS Elemental MediaConvert SDK has added MBAFF encoding support for AVC video and the ability to pass encryption context from the job settings to S3."
+}

.changes/next-release/api-change-polly-20334.json

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+{
+  "type": "api-change",
+  "category": "``polly``",
+  "description": "[``botocore``] Amazon Polly adds new New Zealand English voice - Aria. Aria is available as Neural voice only."
+}

.changes/next-release/api-change-ssm-87345.json

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+{
+  "type": "api-change",
+  "category": "``ssm``",
+  "description": "[``botocore``] Updated Parameter Store property for logging improvements."
+}

.changes/next-release/api-change-transcribe-42056.json

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+{
+  "type": "api-change",
+  "category": "``transcribe``",
+  "description": "[``botocore``] This release adds support for feature tagging with Amazon Transcribe batch jobs."
+}