Install only test dependencies

Author: LKajan

.github/workflows/tests.yml

@@ -33,7 +33,7 @@ jobs:
           apt update && apt install python3-venv -y
           python3 -m venv --system-site-packages .venv
           .venv/bin/python -m pip install -U setuptools pip
-          .venv/bin/pip install -r requirements-dev.txt
+          .venv/bin/pip install -r requirements-test.txt
           .venv/bin/pip install .
 
       - name: Run tests