[chore] Install for added tests

Author: ftnext

.github/workflows/unittests.yml

@@ -32,6 +32,7 @@ jobs:
         run: |
           python -m pip install 'pocketsphinx<5'
           python -m pip install git+https://github.com/openai/whisper.git soundfile
+          python -m pip install openai
           python -m pip install .
       - name: Test with unittest
         run: |