west.yml: update Zephyr to ffd716b4a214 #15980

Job	Run time
build-linux (mnfst, imx8 imx8x imx8m)	4m 23s
build-windows (imx8 imx8x imx8m)	6m 30s
build-linux (mnfst, mtl)	4m 20s
build-windows (mtl)	5m 42s
build-windows (tgl tgl-h)	6m 41s
build-linux (mnfst, lnl)	3m 50s
build-windows (-d, mtl)	5m 45s
build-linux (mnfst, tgl tgl-h)	4m 58s
build-linux (zmain, imx8 imx8x imx8m)	4m 5s
build-linux (zmain, mtl)	3m 54s
LP64-WIP	3m 33s
build-linux (zmain, lnl)	3m 44s
build-linux (zmain, tgl tgl-h)	5m 0s
manifest-check	53s
build-linux (-d, mnfst, mtl)	4m 29s
compare-linux-win	1m 12s
	1h 8m 59s

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