fix(ci): install pyyaml before validating action.yml

Made-with: Cursor

Author: EfeAcar6431

.github/workflows/test.yml

@@ -55,7 +55,9 @@ jobs:
           done
 
       - name: Validate action.yml
-        run: python -c "import yaml; yaml.safe_load(open('action.yml')); print('action.yml OK')"
+        run: |
+          pip install pyyaml
+          python -c "import yaml; yaml.safe_load(open('action.yml')); print('action.yml OK')"
 
   action-test:
     runs-on: ubuntu-latest