Fix: BMDA Windows serial timeouts #1920

Job	Run time
size-diff	46s
build-mingw (windows-2022, ucrt64)	2m 38s
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 40s
build-linux (focal, 96b_carbon)	35s
build-mingw (windows-2022, clang64)	2m 28s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	3m 55s
build-linux (focal, bluepill)	32s
build-linux (focal, f072)	37s
build-linux (focal, f3)	1m 2s
build-linux (focal, f4discovery)	55s
build-linux (focal, hydrabus)	35s
build-linux (focal, launchpad-icdi)	39s
build-linux (focal, native)	52s
build-linux (focal, stlink)	36s
build-linux (focal, stlinkv3)	35s
build-linux (focal, swlink)	1m 0s
	21m 25s

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