Fix workflow error.

Author: isaacrobinson2000

.github/workflows/pytest.yml

@@ -66,7 +66,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+          pip install -r requirements.txt
       - name: Test with pytest
         run: |
           pytest