langgraph: bring back tool content stringify · langchain-ai/langgraph@1d1d0cd

The following actions uses Node.js version which is deprecated and will be forced to run on node20: Ana06/get-changed-files@v2.2.0, actions/cache@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Unexpected input(s) 'working-directory', valid inputs are ['python-version', 'poetry-version', 'cache-key']

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