Make setup.py compatible with pipenv (huggingface#4121)

Author: apoorvaeternity

setup.py

@@ -245,7 +245,7 @@ def run(self):
     packages=find_packages("src"),
     include_package_data=True,
     python_requires=">=3.7.0",
-    install_requires=install_requires,
+    install_requires=list(install_requires),
     extras_require=extras,
     entry_points={"console_scripts": ["diffusers-cli=diffusers.commands.diffusers_cli:main"]},
     classifiers=[