Update windows-x64-release-dev.yml for Azure Pipelines

windows-x64-release-dev.yml

@@ -20,7 +20,7 @@ steps:
 - task: UseDotNet@2
   inputs:
     packageType: 'sdk'
-    version: '7.x'
+    useGlobalJson: true
 - task: NuGetToolInstaller@1
 
 - task: NuGetCommand@2