Add changelog entries from botocore

.changes/next-release/api-change-ec2-38639.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "[``botocore``] U7i instances with up to 32 TiB of DDR5 memory and 896 vCPUs are now available. C7i-flex instances are launched and are lower-priced variants of the Amazon EC2 C7i instances that offer a baseline level of CPU performance with the ability to scale up to the full compute performance 95% of the time."
+}

.changes/next-release/api-change-pipes-62273.json

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+{
+  "type": "api-change",
+  "category": "``pipes``",
+  "description": "[``botocore``] This release adds Timestream for LiveAnalytics as a supported target in EventBridge Pipes"
+}

.changes/next-release/api-change-sagemaker-54814.json

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+{
+  "type": "api-change",
+  "category": "``sagemaker``",
+  "description": "[``botocore``] Extend DescribeClusterNode response with private DNS hostname and IP address, and placement information about availability zone and availability zone ID."
+}

.changes/next-release/api-change-taxsettings-62232.json

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+{
+  "type": "api-change",
+  "category": "``taxsettings``",
+  "description": "[``botocore``] Initial release of AWS Tax Settings API"
+}