west.yml: update Zephyr to f9f44b6dcdd #536

Job	Run time
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	5m 4s
build-windows (imx8 imx8x imx8m imx8ulp)	7m 59s
build-linux (mnfst, mtl)	4m 29s
LP64-WIP	3m 25s
build-windows (mtl)	5m 51s
build-linux (mnfst, lnl)	4m 18s
build-windows (tgl tgl-h)	6m 31s
build-linux (mnfst, tgl tgl-h)	5m 45s
build-windows (-d, mtl)	5m 50s
manifest-check	50s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	4m 55s
build-linux (zmain, mtl)	4m 22s
build-linux (zmain, lnl)	4m 11s
build-linux (zmain, tgl tgl-h)	5m 15s
build-linux (-d, mnfst, mtl)	4m 28s
compare-linux-win	24s
	1h 13m 37s

Provide feedback