Release v0.2.0

What's Changed

• Bump actions/checkout from 4 to 6 by @dependabot[bot] in #1
• fix: vectorstore standard tests compliance and missing methods by @viragtripathi in #2
• feat: add LangGraph checkpointer and multi-tenancy support by @viragtripathi in #3

New Contributors

• @dependabot[bot] made their first contribution in #1
• @viragtripathi made their first contribution in #2

Full Changelog: https://github.com/cockroachdb/langchain-cockroachdb/commits/v0.2.0