Replace mixed TAB/SP with SP-only.

Author: da4089

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
-	  persist-credentials: false
+          persist-credentials: false
       - name: Setup Python ${{ matrix.python-version }}
         uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with: