Added missing MR

ReleaseNotes/v54r6.md

@@ -24,6 +24,7 @@ Built relative to LHCb [v54r5](/../../tags/v54r5), with the following changes:
 - Make name of algorithms independent of instantiation order, !3872 (@sponce) [#267]
 - ~Configuration | Fix trivial typo in GaudiConf/python/GaudiConf/LbExec/cli_utils.py, !3997 (@erodrigu)
 - Fix https://gitlab.cern.ch/lhcb/DaVinci/-/issues/108, !4019 (@pkoppenb)
+- Adapt XMLSummaryKernel tests to change output file creation policy, !4023 (@clemenci)
 
 
 ### Enhancements ~enhancement
@@ -34,8 +35,7 @@ Built relative to LHCb [v54r5](/../../tags/v54r5), with the following changes:
    + Improved error for algo renaming in counters, !4020 (@sponce)
    + Fixes to counter comparison script, !4006 (@sponce)
    + Improvements in counter diff reporting, !4005 (@sponce)
-
-
+ 
 ### Code cleanups and changes to tests ~modernisation ~cleanup ~testing
 
 - Remove LinkerTable and LinkerTool, augment LinkedTo, LinkedFrom, !3988 (@graven)