Add diagnostics and handle errors gracefully / Upgrade Cairo. #7130

Job	Run time
scarb-metadata compatibility check	44s
check-rust	3m 49s
check-website	13s
build test linux x86-64	4m 1s
doc tests	3m 24s
build test windows x86-64	11m 18s
test linux x86-64 1/8	15m 57s
test linux x86-64 2/8	16m 3s
test linux x86-64 3/8	16m 30s
test linux x86-64 4/8	13m 12s
test linux x86-64 5/8	11m 25s
test linux x86-64 6/8	10m 31s
test linux x86-64 7/8	8m 30s
test linux x86-64 8/8	8m 42s
test windows x86-64 1/8	14m 46s
test windows x86-64 2/8	15m 38s
test windows x86-64 3/8	14m 54s
test windows x86-64 4/8	13m 27s
test windows x86-64 5/8	10m 32s
test windows x86-64 6/8	9m 35s
test windows x86-64 7/8	8m 12s
test windows x86-64 8/8	9m 48s
	3h 41m 11s

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