message: Update requirements file again to fix nightly build
diff: @@ -12,7 +12,7 @@ numpy ~= 1.19.5 # NOTE: not the latest version due to py3.6
  opt_einsum ~= 3.3.0
  protobuf >= 3.17.1
  six ~= 1.16.0
  -termcolor ~= 1.1.0 # latest version came out in 2011. others are more-termcolor, termcolor2, etc.
  +termcolor ~= 1.1.0
  typing_extensions ~= 3.10.0.0
  wheel ~= 0.36.2
  wrapt ~= 1.12.1
  @@ -21,13 +21,14 @@ wrapt ~= 1.12.1
  gast == 0.4.0
  # Finally, install tensorboard and estimator and keras
  -# Note that here we want the latest version that matches
  -keras-nightly ~= 2.6.0.dev2021052700
  -tb-nightly ~= 2.5.0.a # matches being 2.5 for the 2.5 release? bc there is a 2.6 out
  -tensorflow_estimator ~= 2.5.0
  +# Note that here we want the latest version that matches TF major.minor version
  +# Note that we must use nightly here as these are used in nightly jobs
  +# For release jobs, we will pin these on the release branch
  +keras-nightly ~= 2.6.0.dev
  +tb-nightly ~= 2.6.0.a
  +tf-estimator-nightly ~= 2.6.0.dev
  # Test dependencies
  grpcio ~= 1.38.0
  portpicker ~= 1.4.0
  -scipy ~= 1.6.3
  -
  +scipy ~= 1.5.4 # NOTE: not the latest version due to py3.6
  