This brings in a bugfix for analyzing variables inside relative traversal expressions in HCL, and a cosmetic bugfix in cty for GoString of cty.NullVal(cty.DynamicPseudoType). This also updates some other packages, as a result of running "go get -u".
* Adding acceptance tests to reproduce issue #12910 * Upgrade go-fastly and its dependencies and move the Version to int as changed upstream