debian/patches/git-updates.diff: update from upstream stable branch:

* debian/patches/git-updates.diff: update from upstream stable branch:
  - Fix a possible assertion failure in iconv when converting
    from ISO-2022-JP-3 to UTF-8 (CVE-2021-3326).  Closes: #981198.
  - Fix a possible double-free in nscd when processing a request for netgroup
    lookup (CVE-2021-27645).  Closes: #983479.