Update changelog based on model updates

.changes/next-release/api-change-connect-65694.json

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+{
+  "type": "api-change",
+  "category": "``connect``",
+  "description": "StartTaskContact API now supports linked task creation with a new optional RelatedContactId parameter"
+}

.changes/next-release/api-change-connectcases-90804.json

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+{
+  "type": "api-change",
+  "category": "``connectcases``",
+  "description": "This release adds the ability to delete domains through the DeleteDomain API. For more information see https://docs.aws.amazon.com/cases/latest/APIReference/Welcome.html"
+}

.changes/next-release/api-change-redshift-81949.json

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+{
+  "type": "api-change",
+  "category": "``redshift``",
+  "description": "Documentation updates for Redshift API bringing it in line with IAM best practices."
+}

.changes/next-release/api-change-securityhub-38133.json

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+{
+  "type": "api-change",
+  "category": "``securityhub``",
+  "description": "New Security Hub APIs and updates to existing APIs that help you consolidate control findings and enable and disable controls across all supported standards"
+}

.changes/next-release/api-change-servicecatalog-76945.json

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+{
+  "type": "api-change",
+  "category": "``servicecatalog``",
+  "description": "Documentation updates for Service Catalog"
+}