Update models_tokens.py with gpt-4o-mini

OpenAI added a new available model - gpt-4o-mini. Adding this model to the supported models, so it would be possible to use it with the Scrapegraph-ai.

Author: Kernick

scrapegraphai/helpers/models_tokens.py

@@ -16,6 +16,7 @@
         "gpt-4-32k": 32768,
         "gpt-4-32k-0613": 32768,
         "gpt-4o": 128000,
+        "gpt-40-mini":128000,
     },
     "azure": {
         "gpt-3.5-turbo": 4096,