Enivronment() should be updated to include graph.microsoft.com

A linter rule caught that I was using graph.microsoft.com within one of my PowerShell deployment scripts and suggested that I instead use a value from environment(). Looking through the options [here ](https://docs.microsoft.com/en-us/azure/azure-resource-manager/bicep/bicep-functions-deployment#example-1 )though, that isn't one of the values provided - rather, there's just the older AAD Graph endpoints which aren't supposed to be used any longer anyway.

Please update this list to include the newer graph.microsoft.com value (or remove it from a checked linter value until otherwise available as the error messages suggests it's fixable, and it's not today).

Thanks!