replace ITKv5 CONST with const #125

Job	Run time
cxx-build-workflow / build-test-cxx (windows-2022)	15m 33s
cxx-build-workflow / build-test-cxx (ubuntu-22.04)	14m 4s
cxx-build-workflow / build-test-cxx (macos-13)	15m 53s
cxx-build-workflow / build-test-cxx (macos-15)	6m 50s
python-build-workflow / build-linux-arm-py (9)	4m 16s
python-build-workflow / build-linux-arm-py (10)	4m 18s
python-build-workflow / build-linux-arm-py (11)	4m 20s
python-build-workflow / build-linux-py (11, _2_28-x64)	4m 52s
python-build-workflow / build-linux-py (10, 2014-x64)	4m 52s
python-build-workflow / build-linux-py (9, 2014-x64)	5m 5s
python-build-workflow / build-macos-arm-py (9)	9m 30s
python-build-workflow / build-macos-arm-py (10)	3m 43s
python-build-workflow / build-windows-python-packages (10)	8m 45s
python-build-workflow / build-macos-arm-py (11)	9m 30s
python-build-workflow / build-windows-python-packages (9)	8m 43s
python-build-workflow / build-linux-py (10, _2_28-x64)	4m 52s
python-build-workflow / build-linux-py (9, _2_28-x64)	4m 50s
python-build-workflow / build-windows-python-packages (11)	8m 49s
python-build-workflow / build-linux-py (11, 2014-x64)	4m 52s
python-build-workflow / test-linux-notebooks	-1s
python-build-workflow / publish-python-packages-to-pypi	0s
	2h 23m 36s

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