chore: bump langchain-core from 1.0.7 to 1.2.5 in /libs/admin-api-lib

Bumps [langchain-core](https://github.com/langchain-ai/langchain) from 1.0.7 to 1.2.5.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-core==1.0.7...langchain-core==1.2.5)

---
updated-dependencies:
- dependency-name: langchain-core
  dependency-version: 1.2.5
  dependency-type: indirect
...

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

Author: dependabot[bot]