[tune](deps): Bump gym[atari] from 0.18.3 to 0.21.0 in /python/requirements/tune

[dependabot]

Bumps gym[atari] from 0.18.3 to 0.21.0.

Release notes

Sourced from gym[atari]'s releases.

0.21.0

-The old Atari entry point that was broken with the last release and the upgrade to ALE-Py is fixed (@​JesseFarebro) -Atari environments now give much clearer error messages and warnings (@​JesseFarebro) -A new plugin system to enable an easier inclusion of third party environments has been added (@​JesseFarebro) -Atari environments now use the new plugin system to prevent clobbered names and other issues (@​JesseFarebro) -pip install gym[atari] no longer distributes Atari ROMs that the ALE (the Atari emulator used) needs to run the various games. The easiest way to install ROMs into the ALE has been to use AutoROM. Gym now has a hook to AutoROM for easier CI automation so that using pip install gym[accept-rom-license] calls AutoROM to add ROMs to the ALE. You can install the entire suite with the shorthand gym[atari, accept-rom-license]. Note that as described in the name name, by installing gym[accept-rom-license] you are confirming that you have the relevant license to install the ROMs. (@​JesseFarebro) -An accidental breaking change when loading saved policies trained on old versions of Gym with environments using the Box2d action space have been fixed. (@​RedTachyon) -Pendulum has had a minor fix to it's physics logic made and the version has been bumped to v1 (@​RedTachyon) -Tests have been refactored into an orderly manner (@​RedTachyon) -Dict spaces now have standard dict helper methods (@​Rohan138) -Environment properties are now forwarded to the wrapper (@​tristandeleu) -Gym now properly enforces calling reset before stepping for the first time (@​ahmedo42) -Proper piping of error messages to stderr (@​XuehaiPan) -Fix video saving issues (@​zlig)

Also, Gym is compiling a list of third party environments to into the new documentation website we're working on. Please submit PRs for ones that are missing: https://github.com/openai/gym/blob/master/docs/third_party_environments.md

0.20.0

Major Change:

• Replaced Atari-Py dependency with ALE-Py and bumped all versions. This is a massive upgrade with many changes, please see the full explainer (@​JesseFarebro)
• Note that ALE-Py does not include ROMs. You can install ROMs in two lines of bash with AutoROM though (pip3 install autorom and then autorom), see https://github.com/PettingZoo-Team/AutoROM. This is the recommended approach for CI, etc.

Breaking changes and new features:

• Add RecordVideo wrapper, deprecate monitor wrapper in favor of it and RecordEpisodeStatistics wrapper (@​vwxyzjn)
• Dependencies used outside of environments (e.g. for wrappers) are now in 'other' extra' (@​jkterry1)
• Moved algorithmic and unused toytext envs (guessing game, hotter colder, nchain, roulette, kellycoinflip) to third party repos (@​jkterry1, @​Rohan138)
• Fixed flatten utility and flatdim in MultiDiscrete sapce (@​tristandeleu)
• Add __setitem__ to dict space (@​jfpettit)
• Large fixes to .contains method for box space (@​FirefoxMetzger)
• Made blackjack environment properly comply with Barto and Sutton book standard, bumped to v1 (@​RedTachyon)
• Added NormalizeObservation and NormalizeReward wrappers (@​vwxyzjn)
• Add __getitem__ and __len__ to MultiDiscrete space (@​XuehaiPan)
• Changed .shape to be a property of box space to prevent unexpected behaviors (@​RedTachyon)

Bug fixes and upgrades:

• Video recorder gracefully handles closing (@​XuehaiPan)
• Remaining unnecessary dependencies in setup.py are resolved (@​jkterry1)
• Minor acrobot performance improvements (@​TuckerBMorgan)
• Pendulum properly renders when 0 force is sent (@​Olimoyo)
• Make observations dtypes be consistent with observation space dtypes for all classic control envs and bipedalwalker (@​RedTachyon)
• Removed unused and long depricated features in registration (@​Rohan138)
• Framestack wrapper now inherits from obswrapper (@​jfpettit)
• Seed method for spaces.Tuple and spaces.Dict now properly function, are fully stochastic, are fully featured and behave in the expected manner (@​XuehaiPan, @​RaghuSpaceRajan)
• Replace time() with perf_counter() for better measurements of short duration (@​zuoxingdong)

0.19.0

Gym 0.19.0 is a large maintenance release, and the first since @​jkterry1 became the maintainer. There should be no breaking changes in this release.

New features:

• Added custom datatype argument to multidiscrete space (@​m-orsini)

... (truncated)

Commits

• c755d5c Tests: don't use editable mode, use import-mode=append (#2429)
• 947b857 Test refactoring (#2427)
• ca42b05 Fix importlib-metadata on Python 3.8 + bump ale-py (#2428)
• 8cc7f97 version 0.21
• 3331efe Move all tests to gym/tests/... (#2425)
• 52b7e5e Add extra [accept-rom-license] for AutoROM (#2420)
• 000a2a0 Update test case for VideoRecorder (#2404)
• d199778 Pendulum updates (#2423)
• 65eebce even more fixes
• 7be352b typo and test
• Additional commits viewable in compare view

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