[AutoPR Microsoft.Azure.Management.ApiManagement] Add schema definition fix from 2021-01-01-preview to 2021-04-01-preview#4472

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openapi-sdkautomation[bot] wants to merge 1 commit intomasterfrom sdkAuto/14883/Microsoft.Azure.Management.ApiManagement

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Commits on Jun 18, 2021

CodeGen from PR 14883 in Azure/azure-rest-api-specs
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