fix test for unready thread on Windows #115

Job	Run time
Prepare the run	6s
alpine-linux-x64	0s
docs / build (debug)	2m 24s
linux-cross-compile / build (aarch64)	10m 28s
linux-x64 / build (debug)	10m 28s
linux-cross-compile / build (arm)	10m 27s
linux-x64 / build (release)	10m 28s
linux-cross-compile / build (s390x)	10m 30s
linux-cross-compile / build (ppc64le)	10m 29s
linux-x64-hs-minimal / build (debug)	3m 34s
linux-cross-compile / build (riscv64)	10m 28s
linux-x64-hs-nopch / build (debug)	10m 27s
linux-x64-hs-zero / build (debug)	6m 21s
macos-aarch64 / build (debug)	5m 39s
linux-x64-hs-optimized / build (debug)	9m 6s
macos-aarch64 / build (release)	4m 50s
macos-x64 / build (debug)	10m 31s
macos-x64 / build (release)	10m 36s
windows-aarch64 / build (debug)	10m 22s
windows-aarch64 / build (release)	10m 21s
windows-x64 / build (debug)	10m 20s
windows-x64 / build (release)	10m 17s
macos-aarch64	0s
windows-x64	1s
linux-x64	1s
macos-x64	1s
	2h 58m 15s

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