fix: resolve CI workflow failures

Author: shijiashuai

.github/workflows/ci.yml

@@ -33,7 +33,7 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: '3.11'
-        cache: pip
+          cache: pip
 
       - name: Check Python formatting
         run: |
@@ -101,7 +101,7 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: '3.11'
-        cache: pip
+          cache: pip
 
       - name: Install Sphinx
         run: |
@@ -134,7 +134,7 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: '3.11'
-        cache: pip
+          cache: pip
 
       - name: Run pre-commit
         uses: pre-commit/action@v3.0.0