[stable-v2.12] versions.json: set version to 2.12.0 #19571

Job	Run time
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	5m 59s
build-windows (imx8 imx8x imx8m imx8ulp)	7m 26s
build-linux (mnfst, mtl)	4m 25s
build-windows (mtl)	6m 10s
LP64-WIP	3m 47s
build-linux (mnfst, lnl)	4m 24s
build-windows (tgl tgl-h)	5m 59s
build-linux (mnfst, tgl tgl-h)	5m 22s
build-windows (-d, mtl)	5m 57s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	5m 51s
manifest-check	54s
build-linux (zmain, mtl)	4m 23s
build-linux (zmain, lnl)	4m 17s
build-linux (zmain, tgl tgl-h)	5m 34s
build-linux (-d, mnfst, mtl)	4m 45s
build-linux (mnfst, --all)	12m 31s
compare-linux-win	29s
	1h 28m 13s

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