[misc] fix: update peft's version in requirements-npu.txt

[zheliuyu]

What does this PR do?

As title.
Limit the version of PEFT to ensure sft's workflow is not interrupted on npu.

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[gemini-code-assist]

Code Review

This pull request aims to update the peft library version for NPU environments. However, the specified version 0.15.2 does not appear to exist in the public PyPI repository, which would cause installation failures. I've added a critical comment to address this by suggesting a valid version and recommending a stricter version pinning for better reproducibility.

[gemini-code-assist]

The specified version peft>=0.15.2 appears to be invalid as it does not exist on PyPI, where the latest version is 0.15.0. This will cause dependency installation to fail.

The version should be corrected to a valid one. For better reproducibility, it's also advisable to pin to an exact version, similar to other packages in this file like transformers and ray.

peft==0.15.0

[zheliuyu]

The latest peft version is v0.17.0

[zheliuyu]

Ready for review. @FightingZhen @vermouth1992