Update changelog based on model updates

.changes/next-release/api-change-cleanrooms-53570.json

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

.changes/next-release/api-change-dynamodb-37532.json

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

.changes/next-release/api-change-iotsitewise-78168.json

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

.changes/next-release/api-change-mediapackagev2-121.json

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

.changes/next-release/api-change-medicalimaging-23651.json

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+{
+  "type": "api-change",
+  "category": "``medical-imaging``",
+  "description": "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-pinpointsmsvoicev2-3497.json

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