[beta] Fix fetching git repos after a force push. #9988
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Fix fetching git repos after a force push. Users have been reporting that the index has not been updating for them. This was caused by the update to libgit2 1.3 (from 1.1) which has changed some behavior around force pushes. The index was squashed on 2021-09-24, and if a user had the index fetched from before that point, and they used nightly-2021-10-14 or newer, then the fetch would succeed, but the `refs/remotes/origin/HEAD` would not get updated. Cargo uses the `origin/HEAD` ref to know what to look at, and thus was looking at old data. The solution here is to use `+` on the refspec to force libgit2 to do a forced update (a fast-forward). I think this may have been introduced in libgit2 1.2 via libgit2/libgit2#5854, though that is just a guess. Fixes rust-lang#9976
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Beta backport of #9979.