ci: disable download of Apache Arrow's util_free_space.sh

The script download is no longer needed for the build process, so it's disabled to reduce unnecessary network calls during CI runs.

.github/workflows/build.yml

@@ -44,6 +44,7 @@ jobs:
           df -BG
           
       - name: Download Apache Arrow's util_free_space.sh
+        if: false
         run: |
           curl -Ls https://raw.githubusercontent.com/apache/arrow/main/ci/scripts/util_free_space.sh | bash