message: Update hexagon NN to use v1.20.0
diff: load("//third_party:repo.bzl", "third_party_http_archive")
  -# Note: Use libhexagon_nn_skel version 1.17 Only with the current version.
  +# Note: Use libhexagon_nn_skel version 1.20 Only with the current version.
  # This comment will be updated with compatible version.
  def repo():
  third_party_http_archive(
  name = "hexagon_nn",
  - sha256 = "a0c011f7795e1a09eb7355be295d6442718b8565cc0e3c58a91671dde2bc99fb",
  + sha256 = "2b0e29a061f389ad52054c12fcae38991b5f731d7a05770c7ac421433ed17cc2",
  urls = [
  - "https://storage.googleapis.com/mirror.tensorflow.org/storage.cloud.google.com/download.tensorflow.org/tflite/hexagon_nn_headers_v1.17.0.0.tgz",
  + "https://storage.googleapis.com/mirror.tensorflow.org/storage.cloud.google.com/download.tensorflow.org/tflite/hexagon_nn_headers_v1.20.0.0.tgz",
  ],
  build_file = "//third_party/hexagon:BUILD",
  )
  