[release 0.21] remove prototype stuff (#8794)

Author: NicolasHug

.github/workflows/prototype-tests-linux-gpu.yml

@@ -583,7 +583,7 @@ def run(self):
         long_description_content_type="text/markdown",
         license="BSD",
         packages=find_packages(exclude=("test",)),
-        package_data={package_name: ["*.dll", "*.dylib", "*.so", "prototype/datasets/_builtin/*.categories"]},
+        package_data={package_name: ["*.dll", "*.dylib", "*.so"]},
         zip_safe=False,
         install_requires=get_requirements(),
         extras_require={