Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-backup-73502.json

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+{
+  "type": "api-change",
+  "category": "``backup``",
+  "description": "[``botocore``] This release introduces a new logically air-gapped vault (Preview) in AWS Backup that stores immutable backup copies, which are locked by default and isolated with encryption using AWS owned keys. Logically air-gapped vault (Preview) allows secure recovery of application data across accounts."
+}

.changes/next-release/api-change-elasticache-29339.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``elasticache``",
+  "description": "[``botocore``] Added support for cluster mode in online migration and test migration API"
+}

.changes/next-release/api-change-servicecatalog-96049.json

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+{
+  "type": "api-change",
+  "category": "``servicecatalog``",
+  "description": "[``botocore``] Introduce support for HashiCorp Terraform Cloud in Service Catalog by addying TERRAFORM_CLOUD product type in CreateProduct and CreateProvisioningArtifact API."
+}