fix(assistant): summary now can output 2000 tokens (#2440)

This pull request increases the token limit for the summary output to
2000 in order to accommodate larger documents.

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### Summary:
This PR increases the token limit for the summary output to 2000 in the
`SummaryAssistant` class to accommodate larger documents.

**Key points**:
- Increased `max_tokens` parameter in `ChatLiteLLM` instance to 2000 in
`process_assistant` function of `SummaryAssistant` class in
`/backend/modules/assistant/ito/summary.py` file.


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backend/modules/assistant/ito/summary.py

@@ -85,7 +85,7 @@ async def process_assistant(self):
 
         data = loader.load()
 
-        llm = ChatLiteLLM(model="gpt-3.5-turbo")
+        llm = ChatLiteLLM(model="gpt-3.5-turbo", max_tokens=2000)
 
         map_template = """The following is one document to summarize that has been split into multiple sections:
         {docs}