bump poetry to 1.3.1

[sdpkjc]

Description

Poetry 1.3 has led to a bug our CI fails, see python-poetry/poetry#7171

python-poetry/poetry#7169 fixed the issue, I suggest to bump poetry directly to 1.4 and get our CI healthy again.

Types of changes

• Bug fix
• New feature
• New algorithm
• Documentation

Checklist:

• I've read the CONTRIBUTION guide (required).
• I have ensured pre-commit run --all-files passes (required).
• I have updated the tests accordingly (if applicable).
• I have updated the documentation and previewed the changes via mkdocs serve.
  • I have explained note-worthy implementation details.
  • I have explained the logged metrics.
  • I have added links to the original paper and related papers.

If you need to run benchmark experiments for a performance-impacting changes:

• I have contacted @vwxyzjn to obtain access to the openrlbenchmark W&B team.
• I have used the benchmark utility to submit the tracked experiments to the openrlbenchmark/cleanrl W&B project, optionally with --capture-video.
• I have performed RLops with python -m openrlbenchmark.rlops.
  • For new feature or bug fix:
    • I have used the RLops utility to understand the performance impact of the changes and confirmed there is no regression.
  • For new algorithm:
    • I have created a table comparing my results against those from reputable sources (i.e., the original paper or other reference implementation).
  • I have added the learning curves generated by the python -m openrlbenchmark.rlops utility to the documentation.
  • I have added links to the tracked experiments in W&B, generated by python -m openrlbenchmark.rlops ....your_args... --report, to the documentation.

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[sdpkjc]

The Modern installer in poetry 1.4 causes our CI to fail under Windows. python-poetry/poetry#7611

1.3.1 does not have this problem and fixes the bug mentioned earlier.

Now our CI is working and we're ready to merge.