message: Update mfem-uberenv to use new installation path
diff: @@ -18,7 +18,7 @@ set -o errexit
  set -o nounset
  uberenv_url="https://github.com/mfem/mfem-uberenv.git"
  -uberenv_ref="222e3743377d8c903e044f80ae44624e1668feb4"
  +uberenv_ref="69c0b425110dd7357ce6928dae89d91f0989f8c3"
  [[ ! -d tests/uberenv ]] && git clone ${uberenv_url} tests/uberenv
  cd tests/uberenv
  