chore(deps): bump git2 from 0.14.2 to 0.16.1 (#588)

Bumps [git2](https://github.com/rust-lang/git2-rs) from 0.14.2 to 0.16.1.
- [Release notes](https://github.com/rust-lang/git2-rs/releases)
- [Commits](rust-lang/git2-rs@libgit2-sys-0.14.2...0.16.1)

---
updated-dependencies:
- dependency-name: git2
  dependency-type: indirect
...

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