newest version of eventhub has no aio namespaces yet (Azure#22954)

Author: scbedd

common/smoketest/requirements-release.txt

@@ -1,7 +1,7 @@
 azure-core>=0.0.0b1
 azure-identity>=0.0.0b1
 azure-cosmos>=4.0.0b5
-azure-eventhub>=0.0.0b1
+azure-eventhub>=0.0.0b1,!=5.8.0a1
 azure-keyvault-certificates>=0.0.0b1
 azure-keyvault-keys>=0.0.0b1
 azure-keyvault-secrets>=0.0.0b1