Fix AsyncEx.AwaitTask cancellation #348

Job	Run time
build-devcontainer	6m 27s
build-devcontainer	6m 27s
build (Debug, ubuntu-latest)	5m 49s
build (Debug, ubuntu-latest)	5m 49s
build (Debug, windows-latest)	4m 9s
build (Debug, windows-latest)	1m 33s
build (Debug, macOS-latest)	17m 38s
build (Debug, macOS-latest)	1m 44s
build (Debug, macos-14)	7m 14s
build (Debug, macos-14)	7m 14s
build (Release, ubuntu-latest)	5m 3s
build (Release, ubuntu-latest)	5m 3s
build (Release, windows-latest)	6m 15s
build (Release, windows-latest)	6m 15s
build (Release, macOS-latest)	4m 6s
build (Release, macOS-latest)	4m 23s
build (Release, macos-14)	7m 34s
build (Release, macos-14)	7m 34s
	1h 50m 17s

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