ci: Add averaged_perceptron_tagger_eng to NLTK downloads

- NLTK now requires averaged_perceptron_tagger_eng for POS tagging
- Fixes 10 postag test failures requiring the tagger resource

Author: lwgray

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -r tests/requirements.txt
-        python -m nltk.downloader popular punkt_tab
+        python -m nltk.downloader popular punkt_tab averaged_perceptron_tagger_eng
 
     - name: Run Unit Tests
       run: |
@@ -91,7 +91,7 @@ jobs:
           conda create -n yellowbrick python=${{ matrix.python-version }} pip --yes
           conda activate yellowbrick
           pip install -r tests/requirements.txt
-          python -m nltk.downloader popular punkt_tab
+          python -m nltk.downloader popular punkt_tab averaged_perceptron_tagger_eng
 
       - name: Run Unit Tests
         shell: bash -l {0}