change the `__awaiter` concept to agree with P3164 #1777

Job	Run time
CPU (Windows) (msvc, Debug)	14m 27s
macos-CPU (MacOS) (clang, Debug)	2m 7s
CPU (Windows) (msvc, Release)	21m 58s
CPU (clang 13, Debug, ubuntu 20.04)	3m 45s
macos-CPU (MacOS) (clang, Release)	2m 8s
CPU (clang 13, Release, ubuntu 20.04)	4m 21s
CPU (gcc 11, Debug, ubuntu 22.04)	3m 50s
CPU (gcc 11, Release, ubuntu 22.04)	3m 15s
CPU (gcc 11, Release, ubuntu 22.04, TSAN)	3m 56s
CPU (gcc 11, Release, ubuntu 22.04, ASAN)	4m 34s
CI (CPU) (MacOS)	1s
CI (CPU)	1s
CI (CPU) (Windows)	2s
	1h 4m 25s

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