Fix whitespace

.github/workflows/github-actions.yml

@@ -15,11 +15,11 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-	  pip install -r requirements.txt
-	  pip install -r requirements_dev.txt
+          pip install -r requirements.txt
+          pip install -r requirements_dev.txt
       - name: Run precommit
         run: |
           pre-commit run --all-files
       - name: Test with unittest
         run: |
-	  python -m unittest tests/*.py
+          python -m unittest tests/*.py