pnpm: fix build error "unsupported URL Type link"

[srghma]

Motivation for this change

fixes svanderburg/node2nix#79 (comment)

based on codaxy/cxjs#279 (comment) link: is same as file:

Before build was failed with error https://pastebin.com/69G0DgKu

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• 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 nox --run "nox-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)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.

---

[dywedir]

@GrahamcOfBorg build nodePackages.pnpm

[dywedir]

Thanks!