message: uber update: use dict for spack_activate in project.json
diff: {
  -"spack_develop_commit": "729bed3fd3e7bd3ecabda3ab25525019f3f83661",
  +"package_name" : "axom",
  "uberenv_package_name" : "uberenv-axom",
  -"spack_activate" : ["py-breathe", "py-numpy", "py-sphinx","py-shroud", "py-pyyaml"]
  +"spack_develop_commit": "729bed3fd3e7bd3ecabda3ab25525019f3f83661",
  +"spack_activate" : {"py-breathe": ["+devtools"],
  + "py-sphinx" : ["+devtools"],
  + "py-shroud" : ["+devtools"],
  + "py-pyyaml" : ["+devtools"],
  + "py-numpy" : ["+python"],
  + "conduit" : ["+python"]}
  }
  