Update code owner for keyvault-certificates related folder. (#16903)
Update code owner for keyvault-certificates related folder. (#16903)

Co-authored-by: Rujun Chen <5f5389e7e071d5dbed2ddbee4b5a9968c2fe3544@microsoft.com>
Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java