west.yml: update Zephyr to c50777a84311 #19312

Job	Run time
manifest-check	49s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 1s
build-windows (imx8 imx8x imx8m imx8ulp)	7m 50s
build-linux (mnfst, mtl)	4m 24s
LP64-WIP	3m 57s
build-windows (mtl)	5m 48s
build-linux (mnfst, lnl)	4m 31s
build-linux (mnfst, tgl tgl-h)	5m 20s
build-windows (tgl tgl-h)	6m 53s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	5m 59s
build-windows (-d, mtl)	5m 32s
build-linux (zmain, mtl)	4m 18s
build-linux (zmain, lnl)	4m 21s
build-linux (zmain, tgl tgl-h)	5m 16s
build-linux (-d, mnfst, mtl)	4m 29s
build-linux (mnfst, --all)	12m 38s
compare-linux-win	21s
	1h 28m 27s

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