Update `layer_norm_eps` to match timm

https://github.com/huggingface/pytorch-image-models/discussions/1810#discussioncomment-5921354

config.json

@@ -10,7 +10,7 @@
   "image_size": 224,
   "initializer_range": 0.02,
   "intermediate_size": 3072,
-  "layer_norm_eps": 1e-12,
+  "layer_norm_eps": 1e-6,
   "model_type": "vit",
   "num_attention_heads": 12,
   "num_channels": 3,