ci: install spacy and download en_core_web_sm model for tests

Author: Aadi Jain

.github/workflows/python-app.yml

@@ -35,7 +35,8 @@ jobs:
     - name: Install lightweight test dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install pytest polars numpy scipy scikit-learn pyyaml duckdb
+        pip install pytest polars numpy scipy scikit-learn pyyaml duckdb spacy
+        python -m spacy download en_core_web_sm
     - name: Run Tests
       run: |
         pytest tests/ -v --ignore=tests/test_audio_utils.py