package/git: bump version to 2.30.2

package/git: bump version to 2.30.2

Fix CVE-2021-21300:

  On case-insensitive file systems with support for symbolic links,
  if Git is configured globally to apply delay-capable clean/smudge
  filters (such as Git LFS), Git could be fooled into running
  remote code during a clone.

For details see [1] and [2].

[1] http://lkml.iu.edu/hypermail/linux/kernel/2102.1/01858.html
[2] http://lkml.iu.edu/hypermail/linux/kernel/2103.1/02533.html

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>