message: Bump devtools sha to one that has the new package type
diff: "package_source_dir" : "../..",
  "package_final_phase" : "",
  "spack_url": "https://github.com/spack/spack",
  -"spack_commit": "e4c1cb380beb088393e47ba9caa27a2e5953b4db",
  +"spack_commit": "764c17053041a65f684ce565a2598d705b04a16b",
  "spack_configs_path": "scripts/spack/devtools_configs",
  "spack_packages_path": "scripts/spack/packages",
  "spack_activate" : {"py-sphinx" : [""],
  