Update Azure dependency version

[lukehoban]

Check if updating the @pulumi/azure dependency version avoids the current flakiness we are seeing in #832.

Errors are all similar to this (but happen periodically but inconsistently across all of the Azure tests):

 updating auth settings for Function App: (Site Name "cloudexample6599904b" / Resource Group "p-it-fv-az914-8-topic-e8ce9f9b-global-bad633d2"): web.AppsClient#UpdateAuthSettings: Failure responding to request: StatusCode=500 -- Original Error: autorest/azure: Service returned an error. Status=500 Code="Unknown" Message="Unknown service error" Details=[{"Code":"InternalServerError","Details":[{"Message":null},{"Code":"InternalServerError"},{"ErrorEntity":{"Code":"InternalServerError","Message":null}}],"Innererror":null,"Message":null,"Target":null}]