Fix tarball builds

Do not refer to <nixpkgs> as it will produce the following message:

"evaluation aborted with the following error message: 'Illegal use of <nixpkgs> in Nixpkgs.'"

pkgs/development/interpreters/clojurescript/lumo/deps.nix

@@ -1,6 +1,6 @@
 # generated by clj2nix-1.0.3
-{ pkgs ? import <nixpkgs> {} }:
-  
+{ pkgs }:
+
   let repos = [
         "https://repo.clojars.org/"
         "https://repo1.maven.org/"
@@ -391,4 +391,3 @@
 
   ];
   }
-