Use v6

Author: kou

.github/workflows/rc.yml

@@ -201,7 +201,7 @@ jobs:
           repository: apache/parquet-testing
           path: arrow/cpp/submodules/parquet-testing
       - name: Set up Python
-        uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6.0.0
+        uses: actions/setup-python@v6
         with:
           cache: 'pip'
           python-version: 3.12
@@ -452,7 +452,7 @@ jobs:
       contents: read
       packages: write
     steps:
-      - uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6.0.0
+      - uses: actions/setup-python@v6
         with:
           cache: 'pip'
       - name: Download source archive