Prepare release `2.7.1` #6672

Job	Run time
check-rust	4m 2s
scarb-metadata compatibility check	37s
build test linux x86-64	5m 0s
check-website	17s
build test windows x86-64	13m 47s
doc tests	3m 2s
test linux x86-64 1/8	7m 22s
test linux x86-64 2/8	8m 3s
test linux x86-64 3/8	10m 8s
test linux x86-64 4/8	6m 13s
test linux x86-64 5/8	7m 26s
test linux x86-64 6/8	6m 29s
test linux x86-64 7/8	3m 42s
test linux x86-64 8/8	3m 0s
test windows x86-64 1/8	7m 4s
test windows x86-64 2/8	7m 26s
test windows x86-64 3/8	9m 25s
test windows x86-64 4/8	6m 23s
test windows x86-64 5/8	7m 20s
test windows x86-64 6/8	6m 8s
test windows x86-64 7/8	4m 17s
test windows x86-64 8/8	3m 56s
	2h 11m 7s

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