OEL-478-pdf-417-ci-unused-dep-check (#8)

Author: ericadohring

.github/workflows/pdf417.yml

@@ -61,5 +61,8 @@ jobs:
       - name: Check Coverage and Tests
         run: mix coveralls
 
+      - name: Check mix.lock for unused dependencies
+        run: mix deps.unlock --check-unused
+
       - name: Credo
         run: mix credo --strict