Bump libgit2-sys from 0.13.4+1.4.2 to 0.13.5+1.4.5

Bumps [libgit2-sys](https://github.com/rust-lang/git2-rs) from 0.13.4+1.4.2 to 0.13.5+1.4.5.
- [Changelog](https://github.com/rust-lang/git2-rs/blob/master/CHANGELOG.md)
- [Commits](rust-lang/git2-rs@libgit2-sys-0.13.4...libgit2-sys-0.13.5)

---
updated-dependencies:
- dependency-name: libgit2-sys
  dependency-type: indirect
...

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