message: Allow Capital letters in function output name in ExpandFunctionDefInput in
  grappler functions.
diff: @@ -119,7 +119,7 @@ Status GrapplerFunctionConnectivity::ExpandFunctionDefInput(
  if (Scanner(remaining)
  .OneLiteral(":")
  .RestartCapture()
  - .One(strings::Scanner::LOWERLETTER)
  + .One(strings::Scanner::LETTER)
  .Any(strings::Scanner::LETTER_DIGIT_UNDERSCORE)
  .GetResult(&remaining, &capture)) {
  node_output = string(capture.data(), capture.size());
  