Drew Rodman d63ef14794 Add DownloadError to catch a broader range of resource download errors.
Adding a broader exception class allows for errors raised in Resource.fetch
to be caught in upgrade and prevent the process from being killed when
a download fails. This should resolve issue 18364.

Fixes Homebrew/homebrew#18364.
Closes Homebrew/homebrew#26618.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
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