Update github workflow

.github/workflows/tests.yml

@@ -16,6 +16,7 @@ jobs:
       run: |
         sudo apt-get update -q
         sudo apt-get install libsodium-dev libsecp256k1-dev libgmp-dev -y
+        poetry run pip install pysodium
         poetry install -v
     - name: Run tests
       run: poetry run pytest tests/