Fix gin-config compatibility error in rl_unplugged notebooks

[Aamod007]

Fixes #428

Problem

Running from rl_unplugged import atari in Colab raises:

TypeError: configurable() got an unexpected keyword argument 'blacklist'

This occurs because dopamine-rl==3.1.2 uses gin-config's deprecated blacklist parameter, which was renamed to denylist in newer gin-config versions.

Solution

Pin gin-config==0.3.0 in the notebook installation cells (this version is already specified in requirements.txt).

Changes

• atari_dqn.ipynb: Added !pip install gin-config==0.3.0 before dopamine-rl
• bsuite.ipynb: Added !pip install gin-config==0.3.0 before dopamine-rl
• test_atari_import.py: Added test to verify the import works without TypeError

Note: This PR addresses the atari_dqn.ipynb error from issue #428. The dmlab_r2d2.ipynb bazel build issue is a separate infrastructure problem with DeepMind Lab that requires upstream fixes.

[polarbe]

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