This extra nixpkgs import has been around for a while, but seems to no
longer be needed (this software is in nixpkgs).
Change-Id: I9932fe01bda97bd8b50ec9192ab185bea69657f9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5050
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>