Remove const qualifiers for class/struct members per C++ guidelines #5263

Job	Run time
build_windows (3.9)	1h 10m 22s
build_linux (3.9)	35m 3s
build_windows (3.10)	1h 5m 34s
build_linux (3.10)	35m 32s
build_windows (3.11)	1h 6m 34s
build_linux (3.11)	38m 44s
build_windows (3.12)	1h 10m 25s
build_linux (3.12)	35m 42s
build_windows (3.13)	1h 10m 25s
build_linux (3.13)	35m 3s
test_examples_linux (3.11, false, ubuntu-22.04)	25m 26s
array-api-conformity (3.10, false, ubuntu-22.04)	5m 33s
test_linux (3.9, false, ubuntu-22.04)	12m 10s
test_linux (3.10, false, ubuntu-22.04)	10m 57s
test_linux (3.11, false, ubuntu-22.04)	12m 29s
test_linux (3.12, false, ubuntu-22.04)	11m 8s
test_linux (3.13, false, ubuntu-22.04)	10m 50s
upload_linux	0s
test_windows (3.9, false, windows-2019)	14m 55s
test_windows (3.10, false, windows-2019)	15m 11s
test_windows (3.11, false, windows-2019)	14m 57s
test_windows (3.12, false, windows-2019)	15m 2s
test_windows (3.13, false, windows-2019)	14m 52s
upload_windows	0s
Clean up anaconda packages	0s
	11h 26m 54s

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