Fix deprecation warning by changing `CLIPFeatureExtractor` to `CLIPImageProcessor`.

model_index.json

@@ -3,7 +3,7 @@
   "_diffusers_version": "0.8.0.dev0",
   "feature_extractor": [
     "transformers",
-    "CLIPFeatureExtractor"
+    "CLIPImageProcessor"
   ],
   "safety_checker": [
     "stable_diffusion",
@@ -29,4 +29,4 @@
     "diffusers",
     "AutoencoderKL"
   ]
-}
+}