libgit2: update 1.7.1 -> 1.7.2

libgit2: update 1.7.1 -> 1.7.2

Update libgit2 to pull in securtiy fixes.

Changelog summary:
- A bug in git_revparse_single is fixed that could cause a Denial of
  Service attack. This fixes CVE-2024-24575

 - A bug in git_index_add is fixed that could lead to arbitrary code execution.
   This fixes CVE-2024-24577

 - A bug in the smart transport negotiation could have caused an out-of-bounds
   read.

Signed-off-by: Simone Weiß <simone.p.weiss@posteo.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>