Update changelog based on model updates

.changes/next-release/api-change-cognitoidp-53825.json

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+{
+  "type": "api-change",
+  "category": "``cognito-idp``",
+  "description": "Add EXTERNAL_PROVIDER enum value to UserStatusType."
+}

.changes/next-release/api-change-ec2-11579.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "Adding Precision Hardware Clock (PHC) to public API DescribeInstanceTypes"
+}

.changes/next-release/api-change-ecr-48109.json

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+{
+  "type": "api-change",
+  "category": "``ecr``",
+  "description": "This release adds pull through cache rules support for GitLab container registry in Amazon ECR."
+}

.changes/next-release/api-change-fms-93806.json

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+{
+  "type": "api-change",
+  "category": "``fms``",
+  "description": "The policy scope resource tag is always a string value, either a non-empty string or an empty string."
+}

.changes/next-release/api-change-polly-82018.json

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+{
+  "type": "api-change",
+  "category": "``polly``",
+  "description": "Add new engine - generative - that builds the most expressive conversational voices."
+}

.changes/next-release/api-change-sqs-87464.json

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+{
+  "type": "api-change",
+  "category": "``sqs``",
+  "description": "This release adds MessageSystemAttributeNames to ReceiveMessageRequest to replace AttributeNames."
+}