versions.json: set version to 2.12.0 #745

Job	Run time
manifest-check	55s
LP64-WIP	3m 46s
build-windows (imx8 imx8x imx8m imx8ulp)	8m 2s
build-windows (mtl)	6m 4s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 5s
build-windows (tgl tgl-h)	6m 3s
build-linux (mnfst, mtl)	4m 33s
build-windows (-d, mtl)	6m 34s
build-linux (mnfst, lnl)	4m 21s
build-linux (mnfst, tgl tgl-h)	5m 30s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 13s
build-linux (zmain, mtl)	4m 23s
build-linux (zmain, lnl)	4m 19s
build-linux (zmain, tgl tgl-h)	5m 24s
build-linux (-d, mnfst, mtl)	4m 18s
build-linux (mnfst, --all)	12m 11s
compare-linux-win	31s
	1h 29m 12s

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