build(deps): update gym[atari] requirement in /requirements

Updates the requirements on [gym[atari]](https://github.com/openai/gym) to permit the latest version.
- [Release notes](https://github.com/openai/gym/releases)
- [Commits](openai/gym@0.17.2...0.26.2)

---
updated-dependencies:
- dependency-name: gym[atari]
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements/models.txt

@@ -1,7 +1,7 @@
 torchvision >=0.10.0
 scikit-learn >=1.0.2
 Pillow >9.0.0
-gym[atari] >=0.17.2, <0.22.0  # strict
+gym[atari] >=0.17.2, <0.27.0  # strict
 atari-py >0.2, !=0.2.6, <0.3  # strict
 box2d-py >2.3, <2.4  # strict
 opencv-python-headless >=4.5.5.62