fix: requirements path

Co-authored-by: Fabian Braun <[email protected]>

.github/workflows/test.yml

@@ -100,7 +100,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install ${{ matrix.requirements-file }}
+        pip install -r tests/requirements/${{ matrix.requirements-file }}
         python setup.py install
 
     - name: Run coverage