suppress warning in GSL code #1216

Job	Run time
tests-Windows-CLI (mingw64, x86_64, 3.8)	8m 7s
canceller	9s
tests-Windows-CLI (ucrt64, ucrt-x86_64, 3.8)	8m 8s
tests-Unix-CLI (ubuntu-20.04, 7, 3.8)	8m 18s
tests-Unix-GUI (ubuntu-20.04, 5.9.5, 7)	4m 52s
tests-Unix-CLI (ubuntu-20.04, 11, 3.9)	8m 15s
tests-Unix-CLI (macos-12, 3.8)	8m 17s
tests-Windows-GUI (mingw64, x86_64)	8m 9s
tests-Unix-GUI (ubuntu-20.04, 5.15.2, 11)	5m 55s
tests-windows-latest-pacman (mingw64, x86_64)	1m 40s
tests-Windows-GUI (ucrt64, ucrt-x86_64)	8m 9s
tests-Unix-CLI (macos-13, 3.9)	8m 16s
tests-Unix-GUI (ubuntu-22.04, 5.15.2, 12)	6m 33s
tests-windows-latest-pacman (ucrt64, ucrt-x86_64)	1m 44s
tests-Unix-GUI (ubuntu-22.04, 6.7.2, 12)	7m 27s
tests-Unix-GUI (macos-12, 5.9.5)	8m 18s
tests-Unix-GUI (macos-13, 5.15.2)	8m 13s
tests-Unix-GUI (macos-13, 6.7.2)	8m 17s
	1h 58m 47s

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