#884 add missing dependency for openai example

.github/workflows/test.yml

@@ -25,7 +25,7 @@ jobs:
           poetry config virtualenvs.create false
           poetry install
           # install packages to run the examples
-          pip install opencv-python opencv-contrib-python-headless httpx replicate
+          pip install opencv-python opencv-contrib-python-headless httpx replicate langchain
           # try fix issue with importlib_resources
           pip install importlib-resources
       - name: test startup