Cannot build v13.12.1, gopkg.in/DataDog/dd-trace-go.v1 v1.31.0 does not exist

The current version is not build able as it references to dependecy gopkg.in/DataDog/dd-trace-go.v1 v1.31.0.

I addressed the problem already here: https://github.com/DataDog/dd-trace-go/issues/929

It seems that version v1.31.0 of dd-trace-go was published by accident and was removed shortly after this. But gitlab-agent reference to this build and therefor it cannot be compiled (referenced here: https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/-/blob/master/go.sum#L1499)

How to fix this?