style: use proper indentation in ruff.yml

Author: vil02

.github/workflows/ruff.yml

@@ -11,6 +11,6 @@ jobs:
   ruff:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
-    - run: pip install --user ruff
-    - run: ruff --output-format=github .
+      - uses: actions/checkout@v4
+      - run: pip install --user ruff
+      - run: ruff --output-format=github .