Build problem with the current `environment.yml` file

Some recent package update seems to have broken the environment.yml file we provide in the starter kit.

We’re still investigating, but right now this minimal environment file is working (flatland-rl is part of the base image and doesn’t need to be added):

name: flatland-rl
  - pytorch
  - conda-forge
  - defaults
  - psutil==5.7.2
  - pytorch==1.6.0
  - pip==20.2.3
  - python==3.6.8
  - pip:
      - tensorboard==2.3.0
      - tensorboardx==2.1
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Related question - can I upgrade to python 3.7 by simply specifying say 3.7.9?