On Windows, use c++20 mode as correctly needed for designated initial… #4094

Job	Run time
ClangTidy	1h 25m 7s
KytheVerification	22s
MacOsBuildDevTools	1m 37s
Generate Build matrix	28s
VerifyFormatting	1m 49s
x86_64 test	3m 51s
arm64 test	11m 49s
KytheXrefs	0s
MacOsBuild	52s
x86_64 test-nortti	13m 22s
PrepareVSPlugin	2m 5s
x86_64 test-c++20	15m 44s
WindowsBuild	23m 16s
x86_64 test-c++23	13m 2s
x86_64 smoke-test	13m 50s
arm64 smoke-test	14m 25s
x86_64 smoke-test-analyzer	17m 58s
arm64 smoke-test-analyzer	17m 33s
x86_64 asan	17m 45s
x86_64 asan-clang	18m 2s
x86_64 compile	3m 4s
arm64 compile	3m 49s
x86_64 compile-clang	2m 58s
arm64 compile-clang	3m 55s
x86_64 compile-static	2m 56s
arm64 compile-static	3m 49s
x86_64 compile-static-clang	2m 57s
arm64 compile-static-clang	3m 46s
x86_64 coverage	17m 14s
x86_64 clean	6m 48s
arm64 clean	6m 54s
Build ·${{ matrix.arch }}:${{ matrix.os }}:${{ matrix.ver }}${{ (((matrix.link == 'static') && ':static') \|\| '') }}	0s
Build and deploy GitHub pages	0s
📦 Release	0s
	5h 31m 7s

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