chore: xrootd-5.6.9
Updating the xrootd client to 5.6.9 to mitigate https://github.com/xrootd/xrootd/issues/2082. Uses https://github.com/spack/spack/commit/62132919e1465a40e3522e40278e4bbc8ec32978.
Updating the xrootd client to 5.6.9 to mitigate https://github.com/xrootd/xrootd/issues/2082. Uses https://github.com/spack/spack/commit/62132919e1465a40e3522e40278e4bbc8ec32978.