Several security issues have been found that were backported only to
2.39.x.

- https://github.com/git/git/blob/master/Documentation/RelNotes/2.39.0.txt
- https://github.com/git/git/blob/master/Documentation/RelNotes/2.39.4.txt
- https://github.com/git/git/blob/master/Documentation/RelNotes/2.39.5.txt

Fixes: #16449