Bump sigs.k8s.io/mdtoc from 1.1.0 to 1.4.0 #10664

Job	Run time
changes	4s
lua-lint	4s
test-go	3m 54s
Verify Doc generation	57s
Build	3m 41s
Chart / Test	0s
Kubernetes (v1.28.13) / Kubernetes	45m 2s
Kubernetes (v1.29.8) / Kubernetes	44m 25s
Kubernetes (v1.30.4) / Kubernetes	47m 39s
Kubernetes chroot (v1.28.13) / Kubernetes CHROOT	44m 48s
Kubernetes (v1.31.0) / Kubernetes	44m 2s
Kubernetes chroot (v1.29.8) / Kubernetes CHROOT	44m 24s
Kubernetes chroot (v1.30.4) / Kubernetes CHROOT	45m 14s
Kubernetes chroot (v1.31.0) / Kubernetes CHROOT	44m 36s
	6h 8m 50s

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