git: Update version from 2.13.3 to 2.13.4

> Git v2.13.4 Release Notes
> =========================
>
> Fixes since v2.13.3
> -------------------
>
>  * Update the character width tables.
>
>  * A recent update broke an alias that contained an uppercase letter,
>    which has been fixed.
>
>  * On Cygwin, similar to Windows, "git push //server/share/repository"
>    ought to mean a repository on a network share that can be accessed
>    locally, but this did not work correctly due to stripping the double
>    slashes at the beginning.
>
>  * The progress meter did not give a useful output when we haven't had
>    0.5 seconds to measure the throughput during the interval.  Instead
>    show the overall throughput rate at the end, which is a much more
>    useful number.
>
>  * We run an early part of "git gc" that deals with refs before
>    daemonising (and not under lock) even when running a background
>    auto-gc, which caused multiple gc processes attempting to run the
>    early part at the same time.  This is now prevented by running the
>    early part also under the GC lock.
>
> Also contains a handful of small code and documentation clean-ups.

[1] https://git.kernel.org/pub/scm/git/git.git/tree/Documentation/RelNotes/2.13.4.txt

git.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION git-2.13.3-0
+# BEE_VERSION git-2.13.4-0
 
 ## this file was created by bee init and should be executed to build a
 ## bee-package. (Additional hints are located at the end of this file.)