Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-iotsitewise-78760.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``iotsitewise``",
+  "description": "Add ComputationModelVersion support in IoT SiteWise APIs"
+}

.changes/next-release/api-change-s3-25638.json

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+{
+  "type": "api-change",
+  "category": "``s3``",
+  "description": "This release includes backward compatibility work on the \"Expires\" parameter."
+}

.changes/next-release/api-change-securityhub-10148.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``securityhub``",
+  "description": "This release adds the RESOURCE_NOT_FOUND error code as a possible value in responses to the following operations: BatchGetStandardsControlAssociations, BatchUpdateStandardsControlAssociations, and BatchGetSecurityControls."
+}