Bump git2 from 0.13.3 to 0.13.4

Bumps [git2](https://github.com/rust-lang/git2-rs) from 0.13.3 to 0.13.4.
- [Release notes](https://github.com/rust-lang/git2-rs/releases)
- [Commits](rust-lang/git2-rs@0.13.3...0.13.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

Cargo.lock

@@ -10,7 +10,7 @@ license = "MIT"
 categories = ["concurrency","asynchronous"]
 
 [dependencies]
-git2 = { version = "0.13.3", default-features = false }
+git2 = { version = "0.13.4", default-features = false }
 rayon-core = "1.7"
 crossbeam-channel = "0.4"
 log = "0.4"