nix/internal: work with v2 lock files

Signed-off-by: Xe <me@christine.website>

lock.json

@@ -1,3 +1,6 @@
 {
-  "https://deno.land/std@0.118.0/fmt/colors.ts": "8368ddf2d48dfe413ffd04cdbb7ae6a1009cf0dccc9c7ff1d76259d9c61a0621"
+  "version": "2",
+  "remote": {
+    "https://deno.land/std@0.118.0/fmt/colors.ts": "8368ddf2d48dfe413ffd04cdbb7ae6a1009cf0dccc9c7ff1d76259d9c61a0621"
+  }
 }

nix/internal.nix

@@ -43,7 +43,7 @@ in {
           }
         ]
       )
-      (importJSON lockfile)
+      (importJSON lockfile).remote
     ))
   );
 }