versions.json: set version to 2.12.0 #744

Job	Run time
LP64-WIP	3m 47s
manifest-check	54s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 13s
build-windows (imx8 imx8x imx8m imx8ulp)	7m 12s
build-windows (mtl)	6m 16s
build-linux (mnfst, mtl)	4m 20s
build-linux (mnfst, lnl)	4m 13s
build-windows (tgl tgl-h)	6m 15s
build-linux (mnfst, tgl tgl-h)	5m 25s
build-windows (-d, mtl)	5m 43s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	5m 53s
build-linux (zmain, mtl)	4m 25s
build-linux (zmain, lnl)	4m 43s
build-linux (zmain, tgl tgl-h)	5m 11s
build-linux (-d, mnfst, mtl)	4m 42s
build-linux (mnfst, --all)	12m 24s
compare-linux-win	31s
	1h 28m 7s

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