Update xrootd version used on Ubuntu to v4.8.4

ci/ubuntu/build-xrootd.sh

@@ -23,10 +23,9 @@ mkdir -p $BASE_PATH
 cd $BASE_PATH
 git clone https://github.com/xrootd/xrootd
 cd xrootd
-git checkout v4.6.0
+git checkout v4.8.4
 mkdir build
 cd build
 cmake .. -DCMAKE_INSTALL_PREFIX="$BASE_PATH/install"
 make
 make install
-

utils/ubuntu-asan.sh

@@ -17,7 +17,7 @@ if [ ! "$(ls -A $XRD_BUILD)" ]; then
   rm -rf xrootd
   git clone https://github.com/xrootd/xrootd
   pushd xrootd
-  git checkout v4.6.0
+  git checkout v4.8.4
   mkdir build && pushd build
 
   XRD_INSTALL=$PWD/install