fix: environment.yml for flatland-rl==4.0.4. Workaround can be removed with flatland==4.0.5. (#163)

Author: chenkins

evaluation/evaluator/environment.yml

@@ -3,4 +3,7 @@ dependencies:
   - python==3.10.16
   - pip:
       - pyyaml
+      # TODO workaround till 4.0.5 is released with fix from https://github.com/flatland-association/flatland-rl/pull/127/
+      - attrs
+      - setuptools
       - flatland-rl==4.0.4