upgrade az.cosmosdb in azpreview.psd1

Author: VeryEarly

tools/AzPreview/AzPreview.psd1

@@ -81,7 +81,7 @@ RequiredModules = @(@{ModuleName = 'Az.Accounts'; ModuleVersion = '2.8.0'; },
             @{ModuleName = 'Az.ConnectedNetwork'; RequiredVersion = '0.1.0'; }, 
             @{ModuleName = 'Az.ContainerInstance'; RequiredVersion = '3.1.0'; }, 
             @{ModuleName = 'Az.ContainerRegistry'; RequiredVersion = '3.0.0'; }, 
-            @{ModuleName = 'Az.CosmosDB'; RequiredVersion = '1.8.0'; }, 
+            @{ModuleName = 'Az.CosmosDB'; RequiredVersion = '1.8.1'; }, 
             @{ModuleName = 'Az.CostManagement'; RequiredVersion = '0.2.0'; }, 
             @{ModuleName = 'Az.CustomLocation'; RequiredVersion = '0.1.0'; }, 
             @{ModuleName = 'Az.CustomProviders'; RequiredVersion = '0.1.0'; },