Add changelog entries from botocore

.changes/next-release/api-change-cleanrooms-28554.json

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+{
+  "type": "api-change",
+  "category": "``cleanrooms``",
+  "description": "[``botocore``] Three enhancements to the AWS Clean Rooms: Disallowed Output Columns, Flexible Result Receivers, SQL as a Seed"
+}

.changes/next-release/api-change-dynamodb-74256.json

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+{
+  "type": "api-change",
+  "category": "``dynamodb``",
+  "description": "[``botocore``] DynamoDB doc only update for July"
+}

.changes/next-release/api-change-iotsitewise-35719.json

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+{
+  "type": "api-change",
+  "category": "``iotsitewise``",
+  "description": "[``botocore``] Adds support for creating SiteWise Edge gateways that run on a Siemens Industrial Edge Device."
+}

.changes/next-release/api-change-mediapackagev2-46553.json

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+{
+  "type": "api-change",
+  "category": "``mediapackagev2``",
+  "description": "[``botocore``] This release adds support for Irdeto DRM encryption in DASH manifests."
+}

.changes/next-release/api-change-medicalimaging-65420.json

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+{
+  "type": "api-change",
+  "category": "``medical-imaging``",
+  "description": "[``botocore``] CopyImageSet API adds copying selected instances between image sets, and overriding inconsistent metadata with a force parameter. UpdateImageSetMetadata API enables reverting to prior versions; updates to Study, Series, and SOP Instance UIDs; and updates to private elements, with a force parameter."
+}

.changes/next-release/api-change-pinpointsmsvoicev2-43299.json

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+{
+  "type": "api-change",
+  "category": "``pinpoint-sms-voice-v2``",
+  "description": "[``botocore``] Update for rebrand to AWS End User Messaging SMS and Voice."
+}