1.68: Fix or revert libgit2-sys 0.14.2

[ehuss]

As explained in #11609, there are some issues with the recent libgit2-sys update. We'll need to either fix it or revert it on rust-lang/rust beta (after the beta branch).

[pinkforest]

Would we able to bump the pinned dependency to 0.14.2+1.5.1 ? RUSTSEC-2023-0003 - CVE-2023-22742

• RUSTSEC-2023-0003: git2 does not verify SSH keys by default geiger-rs/cargo-geiger#452

the underlying windows issues seem closed - Sent a PR to unpin and bump:

• Unpin and bump libgit2-sys #11913