git: update to v2.52.0

Update to git version v2.52.0, this requires changes for these
upstream commits:

* 9f6dfe43c8a55b833ae16486bcafe29b543461f9
  string-list: align string_list_split() with its _in_place() counterpart

* 78237ea53d6546aeab7adb2c7547a1177311ccde
  packfile: split up responsibilities of `reprepare_packed_git()`

* 751808b2a18acba76b824aed4d8b7442bd7f5fca
  packfile: refactor `get_packed_git()` to work on packfile store

Signed-off-by: Christian Hesse <mail@eworm.de>
4 files changed