Fix for mirroring hackage

[isovector]

When attempting to mirror hackage, I received the following error:

mirroring OGL-0.0.2
packAscii: only ASCII inputs are supported, but got Administratörer
CallStack (from HasCallStack):
  error, called at ./Codec/Archive/Tar/PackAscii.hs:44:17 in tar-0.7.0.0-KJyftX2xMxi7opmJZqZodj-tar-internal:Codec.Archive.Tar.PackAscii
  packAscii, called at ./Codec/Archive/Tar/Write.hs:188:28 in tar-0.7.0.0-KJyftX2xMxi7opmJZqZodj-tar-internal:Codec.Archive.Tar.Write

which then crashed hackage-mirror. This PR adds a little handle wrapper around the offending call.

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[Bodigrim]

@isovector I think I just fixed the issue upstream, in tar-0.7.2.0. Could you give it a try?

[isovector]

@Bodigrim I can confirm that tar-0.7.2.0 fixes the issue. Thanks!