[Task]: change langchain4j dependency to langchain4j

[bamaer]

What needs to happen?

The langchain4j dependency currently includes opennlp-tools, which currently has the 2 critical CVEs below.
The language model chat transform doens't use the opennlp-tools dependency. Changing to langchain4j-core wouldn't have an impact on the transform's functionality and would no longer include the opennlp-tools jar.

CVE-2026-42027
CVE-2026-40682

Issue Priority

Priority: 1

Issue Component

Component: Transforms

[bamaer]

.take-issue