Bump vello_cpu 0.0.6 → 0.0.7 and update snapshots

Update vello_cpu to 0.0.7, which produces slightly different
rasterization output. All snapshot tests have been regenerated.

Note: skrifa cannot be bumped to 0.41.0 in this PR because it
pulls in read-fonts 0.38, while harfrust 0.5.2 depends on
read-fonts 0.37. The two FontRef types are incompatible.

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