convert outpaths to use nix-eval-jobs

[zowoq]

Mic92/nixpkgs-review@8ed3acf

nixpkgs-review has added support for nix-eval-jobs which is now in nixpkgs, we should also convert Outpaths to use nix-eval-jobs.

nixpkgs-update/src/Outpaths.hs

Lines 108 to 120 in 3696684

	"nix-env"
	[ "-f",
	outpathFile,
	"-qaP",
	"--no-name",
	"--out-path",
	"--arg",
	"path",
	currentDir,
	"--arg",
	"checkMeta",
	"true",
	"--show-trace"

Also need to update the outpaths parsing to work with the json lines format from nix-eval-jobs.