[GLUTEN-6887][VL] Daily Update Velox Version (dft-2026_05_28)

Upstream Velox's New Commits:
325e8979c by Ali LeClerc, docs: Update VeloxCon banner on homepage (#17626)

Signed-off-by: glutenperfbot <glutenperfbot@glutenproject-internal.com>

Author: glutenperfbot

ep/build-velox/src/get-velox.sh

@@ -18,8 +18,8 @@ set -exu
 
 CURRENT_DIR=$(cd "$(dirname "$BASH_SOURCE")"; pwd)
 VELOX_REPO=https://github.com/IBM/velox.git
-VELOX_BRANCH=dft-2026_05_27
-VELOX_ENHANCED_BRANCH=ibm-2026_05_27
+VELOX_BRANCH=dft-2026_05_28
+VELOX_ENHANCED_BRANCH=ibm-2026_05_28
 VELOX_HOME=""
 RUN_SETUP_SCRIPT=ON
 ENABLE_ENHANCED_FEATURES=OFF