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This updates git2 primarily to pull in the update for libgit2 1.7.2 which fixes three security issues. @weihanglo did some investigation, and it looks like cargo may be susceptible to one of them with rev parsing. I am uncertain of the severity, but the CVE seems to imply that it is mainly a denial-of-service with an infinite loop from a well-crafted spec.
See https://github.com/libgit2/libgit2/releases/tag/v1.7.2 for more information.