build(deps-dev): bump next from 12.3.1 to 15.1.7 in /website #18737

Job	Run time
Setup	6s
get-go-version / Determine Go toolchain version	5s
check-go-mod / check-go-mod	31s
build-amd64	2m 55s
build-s390x	0s
build-386	2m 0s
build-arm	5m 4s
build-distros-success	1s
	10m 42s

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