HAI-439 Upgrade langchain-community to support cost-calculation of gpt-4o model

https://servicemax.atlassian.net/browse/HAI-439

What's Changed

• HAI-439 upgrade langchain-community to 0.2.4 to include cost calcuation setting of gpt-4o by @haoruiqian in #6

New Contributors

• @haoruiqian made their first contribution in #6

Full Changelog: v0.1.5...v0.2.4