Update pyproject.toml version to 0.6.2 (#861)

## Summary
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Update pyproject.toml version to 0.6.2 for new release.

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## Details
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pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "liger_kernel"
-version = "0.6.1"
+version = "0.6.2"
 description = "Efficient Triton kernels for LLM Training"
 urls = { "Homepage" = "https://github.com/linkedin/Liger-Kernel" }
 readme = { file = "README.md", content-type = "text/markdown" }