[AutoPR sdk/network/mgmt-v2019_02_01] add tag package-2019-12 to batch#2203

openapi-sdkautomation[bot] wants to merge 1 commit intosdkAutomation/sdk_network_mgmt-v2019_02_01AzureSDKAutomation/azure-sdk-for-java:sdkAutomation/sdk_network_mgmt-v2019_02_01from

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