Fix c&p error in CI file

Author: Lorenz Kästle

.github/workflows/unittest.yml

@@ -14,7 +14,7 @@ jobs:
       uses: actions/checkout@v6
     - name: Install dependencies
       run: |
-        python -m pip install -r requirements.txt -r requirements-dev.txt
+        python -m pip install -r requirements.txt
     - name: Lint
       run: |
         make lint