submodule--helper: accept '-i' shorthand for update --init #28936

Job	Run time
config	6s
fuzz smoke test	1m 21s
win+Meson build	4m 8s
static-analysis	5m 26s
win build	5m 11s
sparse	3m 44s
documentation	5m 47s
osx-reftable (macos-14)	16m 48s
rust-analysis	1m 29s
osx-gcc (macos-14)	21m 50s
osx-meson (macos-14)	29m 25s
linux-sha256 (ubuntu:rolling)	14m 44s
linux-reftable-leaks (ubuntu:rolling)	44m 1s
linux-breaking-changes (ubuntu:rolling)	11m 15s
win+VS build	0s
fedora-breaking-changes-meson (fedora:latest)	10m 2s
linux-musl-meson (alpine:latest)	8m 7s
linux-asan-ubsan (ubuntu:rolling)	43m 46s
almalinux-8 (almalinux:8)	10m 49s
debian-11 (debian:11)	10m 49s
linux-reftable (ubuntu:rolling)	14m 12s
linux-leaks (ubuntu:rolling)	42m 24s
linux-TEST-vars (ubuntu:20.04)	13m 36s
linux32 (i386/ubuntu:20.04)	10m 48s
osx-clang (macos-14)	18m 27s
win+VS test	0s
linux-meson (ubuntu:rolling)	10m 53s
win+Meson test (2)	10m 20s
win+Meson test (6)	13m 38s
win+Meson test (7)	7m 28s
win+Meson test (3)	8m 30s
win+Meson test (1)	7m 10s
win+Meson test (8)	7m 21s
win+Meson test (9)	7m 4s
win+Meson test (4)	10m 40s
win+Meson test (0)	7m 2s
win+Meson test (5)	5m 28s
win test (7)	7m 51s
win test (0)	6m 53s
win test (2)	6m 51s
win test (4)	10m 12s
win test (1)	6m 26s
win test (9)	5m 36s
win test (3)	10m 17s
win test (5)	9m 36s
win test (8)	6m 36s
win test (6)	12m 58s
	8h 47m 5s

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