remove unused unreleased entry

Author: XiaofeiCao

eng/versioning/version_client.txt

@@ -548,7 +548,6 @@ unreleased_com.azure.v2:azure-core;2.0.0-beta.1
 unreleased_com.azure.v2:azure-identity;2.0.0-beta.1
 unreleased_com.azure.v2:azure-data-appconfiguration;2.0.0-beta.1
 unreleased_io.clientcore:http-netty4;1.0.0-beta.1
-unreleased_com.azure.resourcemanager:azure-resourcemanager-keyvault;2.54.0
 
 # Released Beta dependencies: Copy the entry from above, prepend "beta_", remove the current
 # version and set the version to the released beta. Released beta dependencies are only valid