Auto merge of #13948 - Byron:upgrade-gix, r=epage

upgrade gix from 0.62 to 0.63

This is a bugfix release with various improvements, some of which relevant to safety when checking out (possibly freshly cloned) repositories.

See GHSA-7w47-3wg8-547c and GHSA-49jc-r788-3fc9 (might not be published yet as it was waiting for feedback at the time of writing).

Author: bors