community[patch]: gpt-4o-2024-08-06 costs (#25164)

- **Description:** updated OpenAI cost definitions according to the
following:
  - https://openai.com/api/pricing/
- **Twitter handle:** `@ogawa65a`

---------

Co-authored-by: Chester Curme <chester.curme@gmail.com>

libs/community/langchain_community/callbacks/openai_info.py

@@ -17,9 +17,11 @@ MODEL_COST_PER_1K_TOKENS = {
     # GPT-4o input
     "gpt-4o": 0.005,
     "gpt-4o-2024-05-13": 0.005,
+    "gpt-4o-2024-08-06": 0.0025,
     # GPT-4o output
     "gpt-4o-completion": 0.015,
     "gpt-4o-2024-05-13-completion": 0.015,
+    "gpt-4o-2024-08-06-completion": 0.01,
     # GPT-4 input
     "gpt-4": 0.03,
     "gpt-4-0314": 0.03,