Remove unused requirements.txt check

Author: kg583

.github/workflows/package.yml

@@ -28,7 +28,6 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
         pip install pillow
         pip install numpy
     - name: Test with unittest