Update tokenizer_config.json

tokenizer_config.json

@@ -119,6 +119,6 @@
   "pad_token": "<|endoftext|>",
   "processor_class": "WhisperProcessor",
   "return_attention_mask": false,
-  "tokenizer_class": "WhisperTokenizer",
+  "tokenizer_class": "GPT2Tokenizer",
   "unk_token": "<|endoftext|>"
 }