fix: use package_name variable instead of name in pyproject template

The change ensures consistency with the package naming convention
used throughout the template by using package_name instead of name.

Author: liblaf

template/pyproject.toml.jinja

@@ -92,7 +92,7 @@ channels = ["conda-forge"]
 platforms = ["linux-64"]
 
 [tool.pixi.pypi-dependencies]
-"{{ name }}" = { editable = true, path = "." }
+"{{ package_name }}" = { editable = true, path = "." }
 
 [tool.pixi.system-requirements]
 cuda = "12"