Add changelog entries from botocore

.changes/next-release/api-change-docdb-57.json

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+{
+  "type": "api-change",
+  "category": "``docdb``",
+  "description": "[``botocore``] This release adds Global Cluster Failover capability which enables you to change your global cluster's primary AWS region, the region that serves writes, during a regional outage. Performing a failover action preserves your Global Cluster setup."
+}

.changes/next-release/api-change-ecs-94721.json

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+{
+  "type": "api-change",
+  "category": "``ecs``",
+  "description": "[``botocore``] This release introduces a new ContainerDefinition configuration to support the customer-managed keys for ECS container restart feature."
+}

.changes/next-release/api-change-iam-43644.json

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+{
+  "type": "api-change",
+  "category": "``iam``",
+  "description": "[``botocore``] Make the LastUsedDate field in the GetAccessKeyLastUsed response optional. This may break customers who only call the API for access keys with a valid LastUsedDate. This fixes a deserialization issue for access keys without a LastUsedDate, because the field was marked as required but could be null."
+}

.changes/next-release/api-change-s3-89124.json

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+{
+  "type": "api-change",
+  "category": "``s3``",
+  "description": "[``botocore``] Amazon Simple Storage Service / Features  : Adds support for pagination in the S3 ListBuckets API."
+}