wuffs: fix build by fixing corpus link (#8084)
wuffs: fix build by fixing corpus link (#8084)

Existing corpus link is no longer accessible. Switching to a reliable source.

Fixing this also to unbreak Fuzz Introspector tests here https://github.com/ossf/fuzz-introspector/issues/412#issuecomment-1195537545
google/oss-fuzz,skia-dev/oss-fuzz,skia-dev/oss-fuzz,skia-dev/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,google/oss-fuzz,google/oss-fuzz,google/oss-fuzz,google/oss-fuzz