Update dependency langchain-core to v0.3.81

Signed-off-by: konflux-internal-p02 <170854209+konflux-internal-p02[bot]@users.noreply.github.com>

Author: konflux-internal-p02[bot]

requirements.txt

@@ -149,7 +149,7 @@ langchain==0.3.27
     #   langchain-community
 langchain-community==0.3.29
     # via nemoguardrails (pyproject.toml)
-langchain-core==0.3.76
+langchain-core==0.3.81
     # via
     #   nemoguardrails (pyproject.toml)
     #   langchain