Artifact hash mismatch when installing libpng (Julia 1.6.1)

If @HerAdri was previously successfully using the pkg server to acquire all artifacts and that isn’t working now for some reason, there are a few reasons this could happen:

  1. The default Pkg behavior changed
  2. The user changed JULIA_PKG_SERVER setting
  3. This is a new artifact that the pkg servers don’t have yet

The first thing shouldn’t have happened in a point release. The second presumably didn’t happen or @HerAdri would have mentioned it. That leaves the third thing, which is likely because there was a large influx of huge artifacts over the weekend which has caused delays in pkg servers processing and serving artifacts. They should be caught up soon, at which point this would stop happening since the artifact would be accessible from the pkg server, which presumably is accessible since things were working previously.

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