fetchers::downloadTarball(): Return a cacheable accessor (backport #11285) #11446
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Motivation
downloadTarball()
is used by-I foo=<url>
etc.fetchToStore()
needs the accessor to have a fingerprint to enable caching.Fixes #11271.
Context
Priorities and Process
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This is an automatic backport of pull request #11285 done by [Mergify](https://mergify.com).