versions.json: bump version to 2.7.1 #454

Job	Run time
LP64-WIP	4m 29s
build-linux (mnfst, imx8 imx8x imx8m)	53s
build-windows (imx8 imx8x imx8m)	3m 28s
build-linux (mnfst, tgl tgl-h)	54s
build-windows (tgl tgl-h)	3m 36s
manifest-check	50s
build-linux (mnfst, mtl)	57s
build-windows (mtl)	3m 22s
build-linux (mnfst, lnl)	1m 4s
build-windows (-i IPC4 tgl tgl-h)	3m 30s
build-linux (mnfst, -i IPC4 tgl tgl-h)	52s
build-windows (-d, mtl)	3m 31s
build-linux (-d, mnfst, mtl)	52s
compare-linux-win	16s
	28m 34s

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