relax voronoi tests #2212

Job	Run time
Build	1m 45s
Smoke test	6m 15s
Check format	1m 49s
NetCDF testing (ubuntu-22.04)	4m 52s
Test GNU fortran (macos-13, false)	26m 50s
NetCDF testing (macos-13)	7m 8s
Extended testing (ubuntu-22.04)	18m 12s
Parallel testing (ubuntu-22.04)	33m 47s
NetCDF testing (windows-2022)	13m 16s
Extended testing (macos-13)	35m 12s
Parallel testing (macos-13)	1h 2m 22s
Extended testing (windows-2022)	51m 26s
Parallel testing (windows-2022)	52m 10s
Test GNU fortran (macos-14, false)	20m 57s
Test Intel fortran (ubuntu-22.04)	26m 51s
Test GNU fortran (macos-14, true)	37m 8s
Test Intel fortran (macos-13)	29m 0s
Test Intel fortran (windows-2022)	34m 47s
Test GNU fortran (ubuntu-22.04, false)	39m 59s
Test GNU fortran (ubuntu-22.04, true)	1h 33m 21s
Test GNU fortran (windows-2022, false)	37m 21s
	10h 34m 28s

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