style: fix ruff check

[Gaiejj]

Description

Fix code style according to the newest ruff.

Motivation and Context

Due to the ruff version update, the current code does not comply with the latest ruff specifications. PR #250 has encountered issues during the lint check. This pull request will modify the code according to the latest Ruff specifications, enabling PR #250 to merge after rebasing.

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)

Checklist

Go over all the following points, and put an x in all the boxes that apply.
If you are unsure about any of these, don't hesitate to ask. We are here to help!

• I have read the CONTRIBUTION guide. (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly. (required for a bug fix or a new feature)
• I have updated the documentation accordingly.
• I have reformatted the code using make format. (required)
• I have checked the code using make lint. (required)
• I have ensured make test pass. (required)

[codecov-commenter]

Codecov Report

Merging #251 (6042853) into main (a079102) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 6042853 differs from pull request most recent head 7f3fea6. Consider uploading reports for the commit 7f3fea6 to get more accurate results

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@@            Coverage Diff             @@
##             main     #251      +/-   ##
==========================================
- Coverage   97.03%   97.01%   -0.01%     
==========================================
  Files         138      138              
  Lines        6994     6994              
==========================================
- Hits         6786     6785       -1     
- Misses        208      209       +1     

Impacted Files	Coverage Δ
omnisafe/common/offline/dataset.py	92.49% <100.00%> (+0.04%)	⬆️
omnisafe/envs/core.py	90.62% <100.00%> (ø)
omnisafe/envs/mujoco_env.py	93.33% <100.00%> (ø)
omnisafe/envs/safety_gymnasium_env.py	97.96% <100.00%> (ø)
omnisafe/envs/safety_gymnasium_modelbased.py	94.17% <100.00%> (-0.03%)	⬇️
omnisafe/utils/math.py	94.12% <100.00%> (-2.94%)	⬇️

... and 1 file with indirect coverage changes

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[XuehaiPan]

May also run pre-commit autoupdate to update the ruff version in pre-commit-config.yaml.