git: 2.47.2 -> 2.48.1

This version change includes a change to the contents of the .git
directory, which results in changes to hashes for any fetchgit
invocations that set leaveDotGit to true.  Per the fetchgit
documentation and discussions in #372784, the contents of the .git directory are not stable, so
anyone using that should either only be using it for temporary testing
purposes, or should be removing the .git directory in fetchgit's
postFetch phase, so before the hash is calculated.  That means there's
no need to do any other handling here to avoid compatibility problems,
and can just update the relevant hashes in the fetchgit tests.

There's still a chance this will break some other builds because of the
change to the contents of the .git directory.  If so, whoever's
responsible for those other derivations should either stop using
leaveDotGit, or should follow the documented advice to remove the .git
directory in the postFetch phase.

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