removes source pinning.

argopkgs.json

-{
-  "fetch": {
-    "args": {
-      "fetchSubmodules": false,
-      "rev": "cf88d28ef7ee77956b87e0edc587f3ca96a8b4a7",
-      "sha256": "0gvr8nxppyddjzwbwww3gz09f224h1s1cnxidacbi1mhr4x7l4l6",
-      "url": "https://xgitlab.cels.anl.gov/argo/argopkgs.git"
-    },
-    "fn": "fetchgit"
-  },
-  "rev": "refs/heads/master",
-  "type": "fetchgit",
-  "url": "https://xgitlab.cels.anl.gov/argo/argopkgs.git"
-}
\ No newline at end of file