Tests don't succeed due to sed dependency

[googleson78]

On NixOS (I assume this is the cause), running

> bazel test //tests/haskell_module/repl:haskell_module_repl_cross_library_deps_test_nixpkgs_bazel_4

fails, complaining about a missing sed. I assume this is (directly) related to this discussion - https://github.com/tweag/rules_haskell/pull/1771#discussion_r918747509, and the solution should also be contained there.