fix:swap api py

[phdargen]

Description

Fixes swap api action in python, equivalent to ts (#817)

Tests

Chatbot: python/examples/langchain-cdp-chatbot
Network: Base Mainnet

Prompt: swap 0.1 usdc (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) to 0x4200000000000000000000000000000000000006
-------------------
{"success": true, "transactionHash": "0x54264a593f91c517b2a1c0a196562bb04a9fb41c06a4719437236b8c560af45c", "fromAmount": "0.1", "fromTokenName": "USD Coin", "fromToken": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913", "toAmount": "2.2974650441925e-05", "minToAmount": "2.2745482644066e-05", "toTokenName": "Wrapped Ether", "toToken": "0x4200000000000000000000000000000000000006", "slippageBps": 100, "network": "base-mainnet"}
-------------------
The swap was successful! Here are the details:

- **Swapped**: 0.1 USDC
- **Received**: Approximately 0.000022974650441925 Wrapped Ether (WETH)
- **Transaction Hash**: [0x54264a593f91c517b2a1c0a196562bb04a9fb41c06a4719437236b8c560af45c](https://etherscan.io/tx/0x54264a593f91c517b2a1c0a196562bb04a9fb41c06a4719437236b8c560af45c)
-------------------

Checklist

A couple of things to include in your PR for completeness:

• Added documentation to all relevant README.md files
• Added a changelog entry

[cb-heimdall]

✅ Heimdall Review Status

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[CarsonRoscoe]

LGTM!