Motivation for this change

noticed it was broken when reviewing another package, tried to bump it, but it still failed:

        try:
            with warnings.catch_warnings(record=True):
                # We want to silence any warnings about, e.g. moved modules.
                warnings.simplefilter("ignore", Warning)
>               return pickle.load(f)
E               TypeError: _reconstruct: First argument must be a sub-type of ndarray

looks like serialization is broken with current pandas.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.