test(deps): update examples/nextjs (e2e) to v15 #2733

Job	Run time
ping-cli	8s
wait	24s
wait2	59s
wait2-delay-120	2m 25s
wait2-delay-50	1m 15s
wait3	1m 20s
wait3-for-200-seconds	4m 18s
wait4	26s
wait-multiple	1m 52s
wait-on-nextjs	26s
wait-on-vite	19s
wait-server-starts-after-100-seconds	1m 55s
wait-using-custom-command	32s
	16m 19s

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