list function is no longer available. Prior to Terraform v0.12 it was
the only available syntax for writing a literal list inside an expression,
but Terraform v0.12 introduced a new first-class syntax.
To update an expression like
list(a, b, c), write the following instead:
tolist([a, b, c])
[ ... ] brackets construct a tuple value, and then the
then converts it to a list. For more information on the value types in the
Terraform language, see Type Constraints.