git: update to v2.34.0

Update to git version v2.34.0, this requires changes for these
upstream commits:

* abf897bacd2d36b9dbd07c70b4a2f97a084704ee
  string-list.[ch]: remove string_list_init() compatibility function

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