Fixed constants.py not using hugging face hub environment variable (#5222)

src/diffusers/utils/constants.py

@@ -25,7 +25,7 @@ FLAX_WEIGHTS_NAME = "diffusion_flax_model.msgpack"
 ONNX_WEIGHTS_NAME = "model.onnx"
 SAFETENSORS_WEIGHTS_NAME = "diffusion_pytorch_model.safetensors"
 ONNX_EXTERNAL_WEIGHTS_NAME = "weights.pb"
-HUGGINGFACE_CO_RESOLVE_ENDPOINT = "https://huggingface.co"
+HUGGINGFACE_CO_RESOLVE_ENDPOINT = os.environ.get("HF_ENDPOINT", "https://huggingface.co")
 DIFFUSERS_CACHE = default_cache_path
 DIFFUSERS_DYNAMIC_MODULE_NAME = "diffusers_modules"
 HF_MODULES_CACHE = os.getenv("HF_MODULES_CACHE", os.path.join(hf_cache_home, "modules"))