build(deps): bump langchain-core from 0.2.3 to 1.2.11 in /python/graphy

Bumps [langchain-core](https://github.com/langchain-ai/langchain) from 0.2.3 to 1.2.11.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-core==0.2.3...langchain-core==1.2.11)

---
updated-dependencies:
- dependency-name: langchain-core
  dependency-version: 1.2.11
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

python/graphy/requirements.txt

@@ -11,7 +11,7 @@ gs_interactive==0.3
 langchain==0.2.1
 langchain-chroma==0.1.1
 langchain-community==0.2.1
-langchain-core==0.2.3
+langchain-core==1.2.11
 langchain-experimental==0.0.60
 langchain-google-vertexai==1.0.4
 langchain-huggingface==0.0.3