Add changelog entries from botocore

.changes/next-release/api-change-ec2-33673.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "[``botocore``] Introduced a new clientToken request parameter on CreateNetworkAcl and CreateRouteTable APIs. The clientToken parameter allows idempotent operations on the APIs."
+}

.changes/next-release/api-change-ecs-86206.json

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+{
+  "type": "api-change",
+  "category": "``ecs``",
+  "description": "[``botocore``] Documentation updates for Amazon ECS."
+}

.changes/next-release/api-change-outposts-54047.json

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+{
+  "type": "api-change",
+  "category": "``outposts``",
+  "description": "[``botocore``] DeviceSerialNumber parameter is now optional in StartConnection API"
+}

.changes/next-release/api-change-rds-22061.json

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+{
+  "type": "api-change",
+  "category": "``rds``",
+  "description": "[``botocore``] This release adds support for Aurora Limitless Database."
+}

.changes/next-release/api-change-storagegateway-6273.json

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+{
+  "type": "api-change",
+  "category": "``storagegateway``",
+  "description": "[``botocore``] Add DeprecationDate and SoftwareVersion to response of ListGateways."
+}