[AutoPR sdk/containerregistry/mgmt-v2019_04_01] [acr] update default package tag for containerregistry#1988

openapi-sdkautomation[bot] wants to merge 1 commit intosdkAutomation/sdk_containerregistry_mgmt-v2019_04_01AzureSDKAutomation/azure-sdk-for-java:sdkAutomation/sdk_containerregistry_mgmt-v2019_04_01from

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