Remove override warnings from DDG4 compilation #1588

Job	Run time
key4hep (/cvmfs/sw-nightlies.hsf.org/key4hep/)	28m 52s
g4units (dev3/x86_64-el9-gcc13-opt)	57m 45s
default (LCG_101/x86_64-centos7-gcc11-opt)	28m 37s
Upload Event Payload	2s
default (LCG_102/x86_64-centos9-gcc11-opt)	26m 40s
non-shared (LCG_105/x86_64-centos7-gcc11-opt)	14m 50s
default (LCG_104/x86_64-el9-gcc13-opt)	1h 9m 25s
default (LCG_105/x86_64-ubuntu2204-gcc11-opt)	1h 7m 42s
default (dev3/x86_64-el9-gcc13-opt)	38m 28s
default (dev3/x86_64-el9-clang16-opt)	39m 15s
default (dev4/x86_64-el9-gcc13-opt)	26m 53s
	6h 38m 29s

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