fix(cloudfunctions): switch to the new required api

Signed-off-by: trampfox <trampfox@gmail.com>

config/cloudfunctions/config.go

@@ -22,7 +22,7 @@ func Configure(p *config.Provider) {
 			Schema["build_environment_variables"].Elem = schema.TypeString
 		r.TerraformResource.
 			Schema["environment_variables"].Elem = schema.TypeString
-		config.MarkAsRequired(r.TerraformResource, "region")
+		r.MarkAsRequired("region")
 	})
 
 	p.AddResourceConfigurator("google_cloudfunctions_function_iam_binding", func(r *config.Resource) {