replace ITKv5 CONST with const #121

Job	Run time
cxx-build-workflow / build-test-cxx (ubuntu-22.04)	14m 20s
cxx-build-workflow / build-test-cxx (windows-2022)	15m 24s
python-build-workflow / build-linux-arm-py (9)	5m 6s
cxx-build-workflow / build-test-cxx (macos-13)	13m 52s
python-build-workflow / build-linux-py (9, _2_28-x64)	3m 32s
python-build-workflow / build-linux-arm-py (10)	4m 51s
python-build-workflow / build-linux-py (9, 2014-x64)	3m 35s
cxx-build-workflow / build-test-cxx (macos-15)	6m 39s
python-build-workflow / build-linux-arm-py (11)	1s
python-build-workflow / build-linux-py (10, _2_28-x64)	1s
python-build-workflow / build-linux-py (10, 2014-x64)	1s
python-build-workflow / build-linux-py (11, _2_28-x64)	1s
python-build-workflow / build-macos-arm-py (9)	1s
python-build-workflow / build-linux-py (11, 2014-x64)	1s
python-build-workflow / build-macos-arm-py (10)	4m 2s
python-build-workflow / build-windows-python-packages (9)	11m 19s
python-build-workflow / build-macos-arm-py (11)	1s
python-build-workflow / build-windows-python-packages (10)	11m 10s
python-build-workflow / build-windows-python-packages (11)	1s
python-build-workflow / test-linux-notebooks	0s
python-build-workflow / publish-python-packages-to-pypi	0s
	1h 33m 58s

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