🐛 Prevent git output with signature information (#60584)
When users have something like
[log]
showSignature = true
in their .gitconfig files, invocations of the log or show git
sub-command emit additional information about signatures. This
additional output disturbs the generation of the version_git.jl file,
the additional text is copied verbatim into the file in unexpected
places. The result is a compile failure when Julia tries to load the
file.
To fix it always suppress the output of the signature information. This
has no effects when the setting is disabled anyway.
