CI: use macos 11 for testing #532

Job	Run time
Source distribution	0s
Build Wheels on macos-11-macosx_x86_64	15m 33s
Build Wheels on windows-2019-win32	10m 31s
Build Wheels on windows-2019-win_amd64	9m 6s
Test wheels on macos-11-macosx_x86_64-3.8	36s
Test wheels on macos-11-macosx_x86_64-3.9	37s
Test wheels on macos-11-macosx_x86_64-3.10	35s
Test wheels on macos-11-macosx_x86_64-3.11	44s
Test wheels on windows-2019-win32-3.8	1m 5s
Test wheels on windows-2019-win32-3.9	42s
Test wheels on windows-2019-win32-3.10	1m 5s
Test wheels on windows-2019-win32-3.11	1m 13s
Test wheels on windows-2019-win_amd64-3.8	1m 7s
Test wheels on windows-2019-win_amd64-3.9	1m 0s
Test wheels on windows-2019-win_amd64-3.10	1m 4s
Test wheels on windows-2019-win_amd64-3.11	44s
Building and testing of wheels success	1s
Upload wheels	0s
	45m 43s

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