chore(deps): bump langfuse from 2.39.2 to 2.43.3 in /backend
Bumps [langfuse](https://github.com/langfuse/langfuse) from 2.39.2 to 2.43.3.
- [Release notes](https://github.com/langfuse/langfuse/releases)
- [Commits](https://github.com/langfuse/langfuse/commits)
---
updated-dependencies:
- dependency-name: langfuse
dependency-type: direct:production
update-type: version-update:semver-minor
...
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dependabot[bot]