chore(deps): bump langgraph-checkpoint

Bumps the pip group with 1 update in the / directory: [langgraph-checkpoint](https://github.com/langchain-ai/langgraph).


Updates `langgraph-checkpoint` from 1.0.12 to 3.0.0
- [Release notes](https://github.com/langchain-ai/langgraph/releases)
- [Commits](langchain-ai/langgraph@checkpoint==1.0.12...checkpoint==3.0.0)

---
updated-dependencies:
- dependency-name: langgraph-checkpoint
  dependency-version: 3.0.0
  dependency-type: indirect
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]