west.yml: Update zephyr for sof/imx-stable-v2.15.5 #22163

Job	Run time
LP64-WIP	3m 29s
manifest-check	2m 56s
build-windows (tgl tgl-h)	10m 28s
build-windows (ptl)	10m 22s
build-windows (-d, lnl)	9m 40s
build-windows (imx8 imx8x imx8m imx8ulp)	14m 39s
build-linux (zmain, tgl tgl-h)	5m 31s
build-linux (zmain, mtl lnl)	5m 27s
build-windows (mtl lnl)	11m 45s
build-linux (mnfst, mtl lnl)	5m 43s
build-linux (zmain, ptl)	5m 29s
build-linux (mnfst, tgl tgl-h)	5m 9s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 36s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 52s
build-linux (-d, mnfst, lnl)	4m 38s
build-linux (mnfst, wcl imx95)	7m 14s
build-linux (mnfst, ptl)	6m 15s
compare-linux-win	28s
	2h 2m 41s

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