fix: set model_name='gpt-4o-mini' for all agents to suppress warnings

- Updated all agents in `multi_server_test.py` to explicitly define model name
- Eliminated LiteLLM fallback warnings during runtime
- Ensured proper agent responses in multi-agent MCP test environment

examples/mcp_example/multi_server_test.py

@@ -1,4 +1,3 @@
-
 from swarms import Agent
 from swarms.tools.mcp_integration import MCPServerSseParams
 from swarms.prompts.finance_agent_sys_prompt import FINANCIAL_AGENT_SYS_PROMPT
@@ -37,7 +36,8 @@ finance_agent = Agent(
     max_loops=1,
     mcp_servers=[calc_server],
     interactive=True,
-    streaming_on=True
+    streaming_on=True,
+    model_name="gpt-4o-mini"
 )
 
 # Multi-server agent with access to all operations
@@ -48,7 +48,8 @@ super_agent = Agent(
     max_loops=1,
     mcp_servers=[math_server, calc_server],
     interactive=True,
-    streaming_on=True
+    streaming_on=True,
+    model_name="gpt-4o-mini"
 )
 
 def main():