parallel-checkout: fix stack buffer overflow in Windows poll() with many workers #7000

Job	Run time
config	9s
fuzz smoke test	1m 48s
win+Meson build	4m 21s
win+VS build (arm64)	4m 3s
win build	5m 17s
win+VS build (x64)	4m 8s
static-analysis	6m 3s
rust-analysis	1m 32s
documentation	7m 8s
sparse	3m 57s
osx-clang (macos-14)	17m 54s
osx-meson (macos-14)	21m 23s
osx-reftable (macos-14)	23m 15s
osx-gcc (macos-14)	15m 3s
linux-TEST-vars (ubuntu:20.04)	13m 25s
linux-reftable-leaks (ubuntu:rolling)	31m 20s
linux-musl-meson (alpine:latest)	8m 20s
linux-sha256 (ubuntu:rolling)	13m 17s
debian-11 (debian:11)	9m 5s
fedora-breaking-changes-meson (fedora:latest)	10m 28s
linux-reftable (ubuntu:rolling)	13m 43s
linux-breaking-changes (ubuntu:rolling)	13m 37s
linux-leaks (ubuntu:rolling)	43m 39s
linux-meson (ubuntu:rolling)	14m 24s
linux-asan-ubsan (ubuntu:rolling)	50m 45s
almalinux-8 (almalinux:8)	11m 5s
linux32 (i386/ubuntu:20.04)	10m 15s
win+VS test (3)	11m 4s
win+VS test (6)	7m 51s
win+VS test (9)	16m 20s
win+VS test (0)	1h 2m 4s
win+VS test (1)	10m 44s
win+VS test (5)	10m 27s
win+VS test (4)	10m 35s
win+VS test (7)	6m 42s
win+VS test (8)	6m 10s
win+VS test (2)	6m 56s
win+Meson test (5)	38m 49s
win+Meson test (8)	13m 17s
win+Meson test (0)	9m 21s
win+Meson test (3)	8m 1s
win+Meson test (2)	9m 56s
win+Meson test (9)	14m 2s
win+Meson test (4)	5m 51s
win+Meson test (7)	10m 53s
win+Meson test (6)	13m 15s
win+Meson test (1)	10m 54s
win test (7)	4m 51s
win test (4)	10m 43s
win test (9)	11m 59s
win test (2)	7m 17s
win test (1)	10m 40s
win test (3)	10m 53s
win test (0)	44m 51s
win test (8)	6m 26s
win test (6)	7m 24s
win test (5)	11m 4s
	12h 48m 44s

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