Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-directconnect-62740.json

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+{
+  "type": "api-change",
+  "category": "``directconnect``",
+  "description": "Enable MACSec support and features on Interconnects."
+}

.changes/next-release/api-change-iotsitewise-58891.json

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+{
+  "type": "api-change",
+  "category": "``iotsitewise``",
+  "description": "Add support for native anomaly detection in IoT SiteWise using new Computation Model APIs"
+}

.changes/next-release/api-change-osis-67595.json

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+{
+  "type": "api-change",
+  "category": "``osis``",
+  "description": "Add Pipeline Role Arn as an optional parameter to the create / update pipeline APIs as an alternative to passing in the pipeline configuration body"
+}