Always use latest arrow c++ for RC workflow.

Author: lriggs

.github/workflows/rc.yml

@@ -299,13 +299,13 @@ jobs:
         shell: bash
         run: |
           tar -xf apache-arrow-java-*.tar.gz --strip-components=1
-      - name: Download the latest Apache Arrow C++
-        if: github.event_name != 'schedule'
-        shell: bash
-        run: |
-          ci/scripts/download_cpp.sh
+      # - name: Download the latest Apache Arrow C++
+      #   if: github.event_name != 'schedule'
+      #   shell: bash
+      #   run: |
+      #     ci/scripts/download_cpp.sh
       - name: Checkout Apache Arrow C++
-        if: github.event_name == 'schedule'
+        # if: github.event_name == 'schedule'
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           repository: apache/arrow