j: rev -> tag

Remove interpolation

pkgs/by-name/j/j/package.nix

···
   src = fetchFromGitHub {
     owner = "jsoftware";
     repo = "jsource";
-    rev = "${version}";
+    tag = version;
     hash = "sha256-Afa2QzzgJYijcavurgGH/qwyofNn4rtFMIHzlqJwFGU=";
   };