Revert "[cmake] Update xrootd hash after a new version of the xrootd tar file (root-project#11106)"

This reverts commit ce4ca3e.

Author: bellenot

builtins/xrootd/CMakeLists.txt

@@ -34,7 +34,7 @@ endif()
 ExternalProject_Add(
     XROOTD
     URL ${XROOTD_SRC_URI}
-    URL_HASH SHA256=2d58210161ef61fabad7c86a038f2ef71c2ba1a0e782fcb6b8c92a1ba5f2a2b3
+    URL_HASH SHA256=56a29c88232f2f384e151b148fcaaa8d8db5c5fdc4615193978c8f4f3a99663c
     INSTALL_DIR ${XROOTD_PREFIX}
     CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
                -DCMAKE_PREFIX_PATH:STRING=${OPENSSL_PREFIX}