Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-ec2-74415.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "Added support for skip-os-shutdown option for the EC2 instance stop and terminate operations. This feature enables customers to bypass the graceful OS shutdown, supporting faster state transitions when instance data preservation isn't critical."
+}

.changes/next-release/api-change-glue-90425.json

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+{
+  "type": "api-change",
+  "category": "``glue``",
+  "description": "AWS Glue now supports dynamic session policies for job executions. This feature allows you to specify custom, fine-grained permissions for each job run without creating multiple IAM roles."
+}

.changes/next-release/api-change-workspacesthinclient-38865.json

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+{
+  "type": "api-change",
+  "category": "``workspaces-thin-client``",
+  "description": "Added the lastUserId parameter to the ListDevices and GetDevice API."
+}