0.6.43

## What's Changed
* fix: remove datamodel-code-generator from extras dependencies by @lemorage in https://github.com/letta-ai/letta/pull/2491
* Correct to_google_ai_dict to ensure parts is never empty by @NachoNoCheese in https://github.com/letta-ai/letta/pull/2489
* chore: bump version 0.6.43 by @carenthomas in https://github.com/letta-ai/letta/pull/2500

## New Contributors
* @NachoNoCheese made their first contribution in https://github.com/letta-ai/letta/pull/2489

**Full Changelog**: https://github.com/letta-ai/letta/compare/0.6.42...0.6.43