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We are working on updating the default for all new callback-based Lambdas to Node10 - see <https://github.com/pulumi/pulumi-aws/pull/825|https://github.com/pulumi/pulumi-aws/pull/825>. 

I’m the meantime - there are two options:
1. Use `aws.lambda.CallbackFunction` which let’s use still use a callback but also customize any other inputs. <https://www.pulumi.com/docs/reference/pkg/nodejs/pulumi/aws/lambda/#CallbackFunction|https://www.pulumi.com/docs/reference/pkg/nodejs/pulumi/aws/lambda/#CallbackFunction>
2. Use a single `pulumi.runtime.registerStackTransformation` to override the `runtime: ` property on all Lambda resources. <https://www.pulumi.com/docs/reference/pkg/nodejs/pulumi/pulumi/runtime/#registerStackTransformation|https://www.pulumi.com/docs/reference/pkg/nodejs/pulumi/pulumi/runtime/#registerStackTransformation>