chore(deps-dev): bump the langchain group across 1 directory with 2 updates

Bumps the langchain group with 2 updates in the / directory: [langchain-openai](https://github.com/langchain-ai/langchain) and [langchain](https://github.com/langchain-ai/langchain).


Updates `langchain-openai` from 0.3.34 to 1.1.12
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-openai==0.3.34...langchain-openai==1.1.12)

Updates `langchain` from 1.2.13 to 1.2.15
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain==1.2.13...langchain==1.2.15)

---
updated-dependencies:
- dependency-name: langchain-openai
  dependency-version: 1.1.12
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: langchain
- dependency-name: langchain
  dependency-version: 1.2.15
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: langchain
...

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

Author: dependabot[bot]

pyproject.toml

@@ -29,7 +29,7 @@ dev = [
     "ruff>=0.15.2,<0.16",
     "mypy>=1.0.0,<2",
     "openai>=0.27.8",
-    "langchain-openai>=0.0.5,<0.4",
+    "langchain-openai>=0.0.5,<1.2",
     "langchain>=1,<2",
     "langgraph>=1,<2",
     "autoevals>=0.0.130,<0.1",