update to 2.31.0-rc2
This release includes a fix for CVE-2021-21300¹ in addition to the other
changes along the path to the final 2.31.0 release.
Release notes:
https://github.com/git/git/raw/v2.31.0-rc2/Documentation/RelNotes/2.31.0.txt
¹ Per the 2.17.6 release notes on CVE-2021-21300:
On case-insensitive file systems with support for symbolic links, if
Git is configured globally to apply delay-capable clean/smudge
filters (such as Git LFS), Git could be fooled into running remote
code during a clone.